1
|
Wang S, Wang X, Wang Z, Sun Z, Ye W, Zhao Q. Fracture Behavior and Mechanism of Nb-Si-Based Alloys with Heterogeneous Layered Structure. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2735. [PMID: 38894000 PMCID: PMC11173401 DOI: 10.3390/ma17112735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Revised: 05/28/2024] [Accepted: 05/31/2024] [Indexed: 06/21/2024]
Abstract
Novel Nb-Si-based alloys with heterogeneous layers that have the same composition (Nb-16 at.%Si) but different phase morphologies were designed in this work. Heterogeneous layered structure (HLS) was successfully fabricated in Nb-16Si alloys by layering composite powders after various degrees of mechanical alloying (6 h, 12 h, 18 h, and 24 h) alternately and subsequent spark plasma sintering (SPS). The influence of HLS on the fracture behavior at both room and elevated temperature was investigated via single-edge notched bending (SENB) and high-temperature compression, respectively. The results show that the diversified HLS is obtained by combining hard layers containing fine equiaxed crystals and/or soft ones with coarse lamellar niobium solid solution (Nbss). By affecting the crack propagation in SENB, HLS is favorable for improving the fracture toughness and exhibits a significant increase compared with the corresponding homogenous microstructure. Moreover, for the same HLS, a more excellent performance is achieved when the initial crack is located in the soft layer and extended across the interface to the hard one through crack bridging, crack deflection, crack branching, and shielding effect. Fracture starts in the soft layer (from powders of ball-milled for 12 h) of a 12-24 alloy, and a maximum KQ value (14.89 MPa·mm1/2) is consequently obtained, which is 33.8% higher than that of the homogeneous Nb-16Si alloy. Furthermore, the heterogeneous layered alloys display superior high-temperature compression strength, which is attributable to the dislocation multiplication and fine-grained structure. The proposed strategy in this study offers a promising route for fabricating Nb-Si-based alloys with optimized and improved mechanical properties to meet practical applications.
Collapse
Affiliation(s)
- Sheng Wang
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (S.W.); (Z.W.); (Z.S.); (W.Y.); (Q.Z.)
| | - Xiaoli Wang
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (S.W.); (Z.W.); (Z.S.); (W.Y.); (Q.Z.)
- Shandong Institute of Mechanical Design and Research, Jinan 250031, China
| | - Zhiming Wang
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (S.W.); (Z.W.); (Z.S.); (W.Y.); (Q.Z.)
- Shandong Institute of Mechanical Design and Research, Jinan 250031, China
| | - Zhiping Sun
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (S.W.); (Z.W.); (Z.S.); (W.Y.); (Q.Z.)
- Shandong Institute of Mechanical Design and Research, Jinan 250031, China
| | - Weicheng Ye
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (S.W.); (Z.W.); (Z.S.); (W.Y.); (Q.Z.)
| | - Qihu Zhao
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; (S.W.); (Z.W.); (Z.S.); (W.Y.); (Q.Z.)
| |
Collapse
|
2
|
Keshavarz S, Campbell CE, Reid ACE. Advanced Computational Analysis of Cobalt-Based Superalloys through Crystal Plasticity. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2458. [PMID: 38793524 PMCID: PMC11123004 DOI: 10.3390/ma17102458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/10/2024] [Accepted: 05/11/2024] [Indexed: 05/26/2024]
Abstract
This study introduces an advanced computational method aimed at accelerating continuum-scale processes using crystal plasticity approaches to predict mechanical responses in cobalt-based superalloys. The framework integrates two levels, namely, sub-grain and homogenized, at the meso-scale through crystal plasticity finite element (CPFE) platforms. The model is applicable across a temperature range from room temperature up to 900 °C, accommodating various dislocation mechanisms in the microstructure. The sub-grain level explicitly incorporates precipitates and employs a dislocation density-based constitutive model that is size-dependent. In contrast, the homogenized level utilizes an activation energy-based constitutive model, implicitly representing the γ' phase for efficiency in computations. This level considers the effects of composition and morphology on mechanical properties, demonstrating the potential for cobalt-based superalloys to rival nickel-based superalloys. The study aims to investigate the impacts of elements including tungsten, tantalum, titanium, and chromium through the homogenized constitutive model. The model accounts for the locking mechanism to address the cross-slip of screw dislocations at lower temperatures as well as the glide and climb mechanism to simulate diffusions at higher temperatures. The model's validity is established across diverse compositions and morphologies, as well as various temperatures, through comparison with experimental data. This advanced computational framework not only enables accurate predictions of mechanical responses in cobalt-based superalloys across a wide temperature range, but also provides valuable insights into the design and optimization of these materials for high-temperature applications.
Collapse
Affiliation(s)
- Shahriyar Keshavarz
- Thermodynamics and Kinetics Group, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA; (C.E.C.); (A.C.E.R.)
| | | | | |
Collapse
|
3
|
Yin J, Rao Z, Wu D, Lv H, Ma H, Long T, Kang J, Wang Q, Wang Y, Su R. Interpretable Predicting Creep Rupture Life of Superalloys: Enhanced by Domain-Specific Knowledge. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2307982. [PMID: 38168537 PMCID: PMC10953578 DOI: 10.1002/advs.202307982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 12/13/2023] [Indexed: 01/05/2024]
Abstract
Evaluating and understanding the effect of manufacturing processes on the creep performance in superalloys poses a significant challenge due to the intricate composition involved. This study presents a machine-learning strategy capable of evaluating the effect of the heat treatment process on the creep performance of superalloys and predicting creep rupture life with high accuracy. This approach integrates classification and regression models with domain-specific knowledge. The physical constraints lead to significantly enhanced prediction accuracy of the classification and regression models. Moreover, the heat treatment process is evaluated as the most important descriptor by integrating machine learning with superalloy creep theory. The heat treatment design of Waspaloy alloy is used as the experimental validation. The improved heat treatment leads to a significant enhancement in creep performance (5.5 times higher than the previous study). The research provides novel insights for enhancing the precision of predicting creep rupture life in superalloys, with the potential to broaden its applicability to the study of the effects of heat treatment processes on other properties. Furthermore, it offers auxiliary support for the utilization of machine learning in the design of heat treatment processes of superalloys.
Collapse
Affiliation(s)
- Jiawei Yin
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| | - Ziyuan Rao
- Max‐Planck‐Institut für Eisenforschung40237DüsseldorfGermany
| | - Dayong Wu
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| | - Haopeng Lv
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| | - Haikun Ma
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| | - Teng Long
- School of Materials Science & EngineeringShandong UniversityJingshi Road 17923Jinan250061China
| | - Jie Kang
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| | - Qian Wang
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| | - Yandong Wang
- State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China
| | - Ru Su
- School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei050018China
| |
Collapse
|
4
|
Nayak GK, Holec D, Zelený M. Impact of d-states on transition metal impurity diffusion in TiN. Sci Rep 2023; 13:8244. [PMID: 37217584 PMCID: PMC10203126 DOI: 10.1038/s41598-023-34768-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 05/07/2023] [Indexed: 05/24/2023] Open
Abstract
In this work, we studied the energetics of diffusion-related quantities of transition-metal impurities in TiN, a prototype ceramic protective coating. We use ab-initio calculations to construct a database of impurity formation energies, vacancy-impurity binding energies, migration, and activation energies of 3d and selected 4d and 5d elements for the vacancy-mediated diffusion process. The obtained trends suggest that the trends in migration and activation energies are not fully anti-correlated with the size of the migration atom. We argue that this is caused by a strong impact of chemistry in terms of binding. We quantified this effect for selected cases using the density of electronic states, Crystal Orbital Hamiltonian Population analysis, and charge density analysis. Our results show that the bonding of impurities in the initial state of a diffusion jump (equilibrium lattice position), as well as the charge directionality at the transition state (energy maximum along the diffusion jump pathway), significantly impact the activation energies.
Collapse
Affiliation(s)
- Ganesh Kumar Nayak
- Department of Materials Science, Montanuniversität Leoben, Franz-Josef-Strasse 18, 8700, Leoben, Austria.
- Materials Chemistry, RWTH Aachen University, Kopernikusstraße 10, 52074, Aachen, Germany.
| | - David Holec
- Department of Materials Science, Montanuniversität Leoben, Franz-Josef-Strasse 18, 8700, Leoben, Austria
| | - Martin Zelený
- Faculty of Mechanical Engineering, Institute of Materials Science and Engineering, Brno University of Technology, Technická 2896/2, 616 69, Brno, Czech Republic
| |
Collapse
|
5
|
Keshavarz S, Campbell CE, Reid ACE. Multi-Scale Crystal Plasticity Model of Creep Responses in Nickel-Based Superalloys. MATERIALS 2022; 15:ma15134447. [PMID: 35806572 PMCID: PMC9267878 DOI: 10.3390/ma15134447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/06/2022] [Accepted: 06/17/2022] [Indexed: 12/04/2022]
Abstract
The current study focuses on the modeling of two-phase γ-γ′ nickel-based superalloys, utilizing multi-scale approaches to simulate and predict the creep behaviors through crystal plasticity
finite element (CPFE) platforms. The multi-scale framework links two distinct levels of the spatial spectrum, namely, sub-grain and homogenized scales, capturing the complexity of the system responses as a function of a tractable set of geometric and physical parameters. The model considers two dominant features of γ′ morphology and composition. The γ′ morphology is simulated using
three parameters describing the average size, volume fraction, and shape. The sub-grain level is expressed by a size-dependent, dislocation density-based constitutive model in the CPFE framework with the explicit depiction of γ-γ′ morphology as the building block of the homogenized scale. The
homogenized scale is developed as an activation energy-based crystal plasticity model reflecting intrinsic composition and morphology effects. The model incorporates the functional configuration of the constitutive parameters characterized over the sub-grain γ-γ′ microstructural morphology. The developed homogenized model significantly expedites the computational processes due to the
nature of the parameterized representation of the dominant factors while retains reliable accuracy. Anti-Phase Boundary (APB) shearing and, glide-climb dislocation mechanisms are incorporated in the constitutive model which will become active based on the energies associated with the dislocations.
The homogenized constitutive model addresses the thermo-mechanical behavior of nickel-based superalloys for an extensive temperature domain and encompasses orientation dependence as well as the loading condition of tension-compression asymmetry aspects. The model is validated for diverse compositions, temperatures, and orientations based on previously reported data of single crystalline nickel-based superalloy.
Collapse
|
6
|
Near-Surface and Bulk Dissolution Behavior of γ′ Precipitates in Nickel-Based VDM® Alloy 780 Studied with In-Situ Lab-Source and Synchrotron X-ray Diffraction. METALS 2022. [DOI: 10.3390/met12071067] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The dissolution of nano-sized Ni3Al-based γ′ precipitates was investigated in the newly developed polycrystalline nickel-based VDM® Alloy 780 at the surface and in the bulk region with in-situ lab-source and synchrotron X-ray diffraction. These studies are important in obtaining a deeper understanding of the strengthening mechanism responsible for the stability and long service lives of such superalloys. We found that the dissolution behavior of the γ′ phase is very similar at the surface and in the bulk region, but small deviations were detected. The dissolution of γ′ starts at around 800 °C and no γ′ was found at temperatures exceeding 970 °C. As a result, the elements Al and Nb, which were bound in the γ′ phase, dissolved into the γ matrix and strongly increased the γ lattice parameter, as their atomic size is larger than the γ-forming elements Ni, Co, and Cr. However, this effect was suppressed in the surface area. A second matrix γ phase was detected at the same temperature range as that of the dissolution of the γ′ phase in the lab-source XRD measurements. The newly formed γ-2 phase had a smaller lattice parameter than that of the initial γ matrix. We propose that the γ-2 matrix phase is a result of high-temperature surface oxidation, which consumes, among other elements, Al and Nb and, therefore, leads to the smaller γ lattice parameter.
Collapse
|
7
|
Optimize the Mechanical Properties of Al0.6CoCrFeNi High-Entropy Alloys by Thermo-Mechanical Processing. METALS 2022. [DOI: 10.3390/met12020178] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The phase stability, microstructural evolution, and mechanical properties of Al0.6CoCrFeNi high-entropy alloy (HEA) subjected to different thermo-mechanical treatments were systematically investigated in the present study. The face center cubic (FCC) matrix, B2, and minor Body Center Cubic (BCC) phases were observed in the as-cast state. The morphology of the B2 precipitates evolved from needle-like to droplet-shaped when annealed at 900 °C, 1000 °C, and 1100 °C. The resulting yield stress of this FCC/B2 duplex-phase HEA after annealing heat treatments was successfully analyzed based on the contributions from solid solution strengthening, precipitate strengthening, grain boundary hardening, and dislocation hardening.
Collapse
|
8
|
Abstract
Very high temperature creep properties of twelve different Ni-based single crystal superalloys have been investigated at 1250 °C and under different initial applied stresses. The creep strength at this temperature is mainly controlled by the remaining γ′ volume fraction. Other parameters such as the γ′ precipitate after microstructure evolution and the γ/γ′ lattice parameter mismatch seem to affect the creep strength to a lesser degree in these conditions. The Norton Law creep exponent lies in the range 6–9 for most of the alloys studied, suggesting that dislocation glide and climb are the rate limiting deformation mechanisms. Damage mechanisms in these extreme conditions comprise creep strain accumulation leading to pronounced necking and to recrystallization in the most severely deformed sections of the specimens.
Collapse
|
9
|
Scholz F, Cevik M, Hallensleben P, Thome P, Eggeler G, Frenzel J. A 3D Analysis of Dendritic Solidification and Mosaicity in Ni-Based Single Crystal Superalloys. MATERIALS 2021; 14:ma14174904. [PMID: 34500993 PMCID: PMC8432729 DOI: 10.3390/ma14174904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 08/19/2021] [Accepted: 08/21/2021] [Indexed: 11/16/2022]
Abstract
Ni-based single crystal superalloys contain microstructural regions that are separated by low-angle grain boundaries. This gives rise to the phenomenon of mosaicity. In the literature, this type of defect has been associated with the deformation of dendrites during Bridgman solidification. The present study introduces a novel serial sectioning method that allows to rationalize mosaicity on the basis of spatial dendrite growth. Optical wide-field micrographs were taken from a series of cross sections and evaluated using quantitative image analysis. This allowed to explore the growth directions of close to 2500 dendrites in a large specimen volume of approximately 450 mm3. The application of tomography in combination with the rotation vector base-line electron back-scatter diffraction method allowed to analyze how small angular differences evolve in the early stages of solidification. It was found that the microstructure consists of dendrites with individual growth directions that deviate up to ≈4° from the average growth direction of all dendrites. Generally, individual dendrite growth directions coincide with crystallographic <001> directions. The quantitative evaluation of the rich data sets obtained with the present method aims at contributing to a better understanding of elementary processes that govern competitive dendrite growth and crystal mosaicity.
Collapse
|
10
|
Han D, Jiang W, Xiao J, Li K, Lu Y, Lou L. Influence of Geometric Structure and Feeding Behavior of Casting on Freckle Formation during Directional Solidification of a Ni‐Based Single‐Crystal Superalloy. CRYSTAL RESEARCH AND TECHNOLOGY 2021. [DOI: 10.1002/crat.202000197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Dongyu Han
- Shi‐changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China
- School of Materials Science and Engineering University of Science and Technology of China Shenyang Liaoning 110016 China
| | - Weiguo Jiang
- Shi‐changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China
- University of Science and Technology Shouguang Shandong 262700 China
| | - Jiuhan Xiao
- Shi‐changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China
- School of Materials Science and Engineering University of Science and Technology of China Shenyang Liaoning 110016 China
| | - Kaiwen Li
- Shi‐changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China
| | - Yuzhang Lu
- Shi‐changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China
| | - Langhong Lou
- Shi‐changxu Innovation Center for Advanced Materials, Institute of Metal Research Chinese Academy of Sciences Shenyang Liaoning 110016 China
| |
Collapse
|
11
|
Composition rules of Ni-base single crystal superalloys and its influence on creep properties via a cluster formula approach. Sci Rep 2020; 10:21621. [PMID: 33303877 PMCID: PMC7728759 DOI: 10.1038/s41598-020-78690-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 11/26/2020] [Indexed: 11/25/2022] Open
Abstract
The present work investigated the composition evolution of the TMS series of Ni-base single crystal (SC) superalloys in light of the cluster formula approach systematically. The cluster formula of SC superalloys could be expressed with \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${[}\overline{{{\text{Al}}}} {-} \overline{{{\text{Ni}}}} 12{](}\overline{{{\text{Al}}}} {, }\overline{{{\text{Cr}}}} {)}m$$\end{document}[Al¯-Ni¯12](Al¯,Cr¯)m, in which all the alloying elements were classified into three groups, Al series (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\overline{{{\text{Al}}}}$$\end{document}Al¯), Cr series (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\overline{{{\text{Cr}}}}$$\end{document}Cr¯), and Ni series (\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$\overline{{{\text{Ni}}}}$$\end{document}Ni¯). It was found that the total atom number (Z) of the cluster formula units for TMS series of superalloys varies from Z ~ 17 to Z ~ 15.5, and then to Z ~ 16 with the alloy development from the 1st to the 6th generation, in which the superalloys with prominent creep resistance possess an ideal cluster formula of \documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$${[}\overline{{{\text{Al}}}} {-} \overline{{{\text{Ni}}}} 12{](}\overline{{{\text{Al}}}} 1.5\overline{{{\text{Cr}}}} 1.5{)}$$\end{document}[Al¯-Ni¯12](Al¯1.5Cr¯1.5) with Z = 16. Similar tendency of composition evolution also appears in the PWA and CMSX series of SC superalloys. Typical TMS series of superalloys with prominent creep properties generally exhibit a moderate lattice misfit of γ/γ′ which could render alloys with appropriate particle size of cuboidal γ′ precipitates to acquire a maximum strength increment by precipitation strengthening mechanism. More importantly, the relationship between the lattice misfit (δ) of γ/γ′ and the creep rupture lifetime (tr) of superalloys was then established, showing a linear correlation in the form of lgtr–lg|δ|3/2 at both conditions of 900 °C/392 MPa and 1100 °C/137 MPa. Combined with the lattice misfit, the cluster formula approach would provide a new way to modify or optimize the compositions of Ni-base superalloys for further improvement of creep property.
Collapse
|
12
|
Characterization of γ' Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD. MATERIALS 2020; 13:ma13102397. [PMID: 32455991 PMCID: PMC7288281 DOI: 10.3390/ma13102397] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 05/13/2020] [Accepted: 05/20/2020] [Indexed: 11/16/2022]
Abstract
In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ′ precipitates, their volume fraction, evolution of the lattice parameter of γ and γ′ phases and misfit parameter of γ′ in the matrix. Material in the initial condition is characterised by a high-volume fraction (over 63%) of γ′ precipitates. Irregular distribution of alloying elements was observed. Matrix channels were strongly enriched in Cr, Co, W and Mo, whereas precipitates contain large amount of Al, Ti, Ta and Hf. Exposure to high-homologous temperatures in the range 1100–1250 °C led to the dissolution of the precipitates, which influenced the change of lattice parameter of both γ and γ′ phases. The lattice parameter of the matrix continuously grew during holding at high temperatures, which had a dominant influence on the more negative misfit coefficient.
Collapse
|
13
|
Feng X, Kawabata K, Cowan MG, Dwulet GE, Toth K, Sixdenier L, Haji-Akbari A, Noble RD, Elimelech M, Gin DL, Osuji CO. Single crystal texture by directed molecular self-assembly along dual axes. NATURE MATERIALS 2019; 18:1235-1243. [PMID: 31209387 DOI: 10.1038/s41563-019-0389-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
Creating well-defined single-crystal textures in materials requires the biaxial alignment of all grains into desired orientations, which is challenging to achieve in soft materials. Here we report the formation of single crystals with rigorously controlled texture over macroscopic areas (>1 cm2) in a soft mesophase of a columnar discotic liquid crystal. We use two modes of directed self-assembly, physical confinement and magnetic fields, to achieve control of the orientations of the columnar axes and the hexagonal lattice along orthogonal directions. Field control of the lattice orientation emerges in a low-temperature phase of tilted discogens that breaks the field degeneracy around the columnar axis present in non-tilted states. Conversely, column orientation is controlled by physical confinement and the resulting imposition of homeotropic anchoring at bounding surfaces. These results extend our understanding of molecular organization in tilted systems and may enable the development of a range of new materials for distinct applications.
Collapse
Affiliation(s)
- Xunda Feng
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA
- Center for Advanced Low-dimension Materials, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, China
| | - Kohsuke Kawabata
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
| | - Matthew G Cowan
- Department of Chemistry, University of Colorado, Boulder, CO, USA
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO, USA
| | - Gregory E Dwulet
- Department of Chemistry, University of Colorado, Boulder, CO, USA
| | - Kristof Toth
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA
| | | | - Amir Haji-Akbari
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA
| | - Richard D Noble
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO, USA
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA
| | - Douglas L Gin
- Department of Chemistry, University of Colorado, Boulder, CO, USA
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO, USA
| | - Chinedum O Osuji
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT, USA.
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, USA.
| |
Collapse
|
14
|
In Situ Creep Behavior Characterization of Single Crystal Superalloy by UV-DIC at 980 °C. COATINGS 2019. [DOI: 10.3390/coatings9100598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
High temperature creep resistance is a critical characteristic of Ni-based single crystal (SX) superalloys. In this work, the creep behavior of a Ni-based SX superalloy was in situ characterized at 980 °C by ultraviolet (UV) imaging combined two-dimensional digital image correlation (DIC) in vacuum environment. The surface pattern was fabricated to maintain stable over 65 h at 980 °C. The pattern images captured by UV imaging were analyzed using mean gray value and the full-field strain map of creep deformation was obtained. A laser displacement senor (LDS) was employed for measuring the creep strain on the specimen for comparison. The creep deformation result shows a good agreement between DIC and LDS, the microstructure of the different creep areas on the specimens also demonstrate that the results of DIC are reliable. The in situ creep characterization by UV-DIC shows a great potential for investigating creep behaviors at high temperatures.
Collapse
|
15
|
Abstract
In recent years, a great effort has been devoted to developing a new generation of materials for aeronautic applications. The driving force behind this effort is the reduction of costs, by extending the service life of aircraft parts (structural and engine components) and increasing fuel efficiency, load capacity and flight range. The present paper examines the most important classes of metallic materials including Al alloys, Ti alloys, Mg alloys, steels, Ni superalloys and metal matrix composites (MMC), with the scope to provide an overview of recent advancements and to highlight current problems and perspectives related to metals for aeronautics.
Collapse
|
16
|
Agudo Jácome L, Pöthkow K, Paetsch O, Hege HC. Three-dimensional reconstruction and quantification of dislocation substructures from transmission electron microscopy stereo pairs. Ultramicroscopy 2018; 195:157-170. [PMID: 30292862 DOI: 10.1016/j.ultramic.2018.08.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 07/24/2018] [Accepted: 08/24/2018] [Indexed: 11/29/2022]
Abstract
A great amount of material properties is strongly influenced by dislocations, the carriers of plastic deformation. It is therefore paramount to have appropriate tools to quantify dislocation substructures with regard to their features, e.g., dislocation density, Burgers vectors or line direction. While the transmission electron microscope (TEM) has been the most widely-used equipment implemented to investigate dislocations, it usually is limited to the two-dimensional (2D) observation of three-dimensional (3D) structures. We reconstruct, visualize and quantify 3D dislocation substructure models from only two TEM images (stereo pairs) and assess the results. The reconstruction is based on the manual interactive tracing of filiform objects on both images of the stereo pair. The reconstruction and quantification method are demonstrated on dark field (DF) scanning (S)TEM micrographs of dislocation substructures imaged under diffraction contrast conditions. For this purpose, thick regions (>300 nm) of TEM foils are analyzed, which are extracted from a Ni-base superalloy single crystal after high temperature creep deformation. It is shown how the method allows 3D quantification from stereo pairs in a wide range of tilt conditions, achieving line length and orientation uncertainties of 3% and 7°, respectively. Parameters that affect the quality of such reconstructions are discussed.
Collapse
Affiliation(s)
- Leonardo Agudo Jácome
- Bundesanstalt für Materialforschung und -prüfung (BAM), Department for Materials Technology, Unter den Eichen 87, 12205 Berlin, Germany.
| | - Kai Pöthkow
- Zuse Institute Berlin, Department for Visual Data Analysis, Takustraße 7, 14195 Berlin, Germany
| | - Olaf Paetsch
- Zuse Institute Berlin, Department for Visual Data Analysis, Takustraße 7, 14195 Berlin, Germany
| | - Hans-Christian Hege
- Zuse Institute Berlin, Department for Visual Data Analysis, Takustraße 7, 14195 Berlin, Germany
| |
Collapse
|
17
|
Schenk T, Trehorel R, Dirand L, Jacques A. Dislocation Densities and Velocities within the γ Channels of an SX Superalloy during In Situ High-Temperature Creep Tests. MATERIALS 2018; 11:ma11091527. [PMID: 30149568 PMCID: PMC6164353 DOI: 10.3390/ma11091527] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/07/2018] [Accepted: 08/10/2018] [Indexed: 11/25/2022]
Abstract
The high-temperature creep behavior of a rafted [001] oriented AM1 Ni-based single crystal superalloy was investigated during in situ creep tests on synchrotrons. Experiments were performed at constant temperatures under variable applied stress in order to study the response (plastic strain, load transfer) to stress jumps. Using two different diffraction techniques in transmission (Laue) geometry, it was possible to measure the average lattice parameters of both the γ matrix and the γ′ rafts in the [100] direction at intervals shorter than 300 s. The absolute precision with both diffraction techniques of the constrained transverse mismatch (in the rafts’ plane) is about 10−5. After stress jumps, special attention is given to the evolution of plastic strain within the γ channels. The relaxation of the Von Mises stress at leveled applied stress shows evidence of dislocation multiplication within the γ channels. From the analysis, we showed an interaction between plastic stress and dislocation density of the γ phase.
Collapse
Affiliation(s)
- Thomas Schenk
- Institute Jean Lamour, CNRS UMR 7198, 54011 Nancy, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, 57073 Metz, France.
| | | | | | - Alain Jacques
- Institute Jean Lamour, CNRS UMR 7198, 54011 Nancy, France.
- Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, 57073 Metz, France.
| |
Collapse
|
18
|
Morphology Dependent Flow Stress in Nickel-Based Superalloys in the Multi-Scale Crystal Plasticity Framework. CRYSTALS 2017. [DOI: 10.3390/cryst7110334] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
19
|
Tsao TK, Yeh AC, Kuo CM, Kakehi K, Murakami H, Yeh JW, Jian SR. The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy. Sci Rep 2017; 7:12658. [PMID: 28978946 PMCID: PMC5627260 DOI: 10.1038/s41598-017-13026-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 09/19/2017] [Indexed: 11/27/2022] Open
Abstract
This article presents the high temperature tensile and creep behaviors of a novel high entropy alloy (HEA). The microstructure of this HEA resembles that of advanced superalloys with a high entropy FCC matrix and L12 ordered precipitates, so it is also named as "high entropy superalloy (HESA)". The tensile yield strengths of HESA surpass those of the reported HEAs from room temperature to elevated temperatures; furthermore, its creep resistance at 982 °C can be compared to those of some Ni-based superalloys. Analysis on experimental results indicate that HESA could be strengthened by the low stacking-fault energy of the matrix, high anti-phase boundary energy of the strengthening precipitate, and thermally stable microstructure. Positive misfit between FCC matrix and precipitate has yielded parallel raft microstructure during creep at 982 °C, and the creep curves of HESA were dominated by tertiary creep behavior. To the best of authors' knowledge, this article is the first to present the elevated temperature tensile creep study on full scale specimens of a high entropy alloy, and the potential of HESA for high temperature structural application is discussed.
Collapse
Affiliation(s)
- Te-Kang Tsao
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan R.O.C
- National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki, 305-0047, Japan
| | - An-Chou Yeh
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan R.O.C..
| | - Chen-Ming Kuo
- Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung, 84001, Taiwan R.O.C
| | - Koji Kakehi
- Department of Mechanical Engineering, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji-shi, Tokyo, 192-0397, Japan
| | - Hideyuki Murakami
- National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki, 305-0047, Japan
| | - Jien-Wei Yeh
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan R.O.C
| | - Sheng-Rui Jian
- Department of Materials Science and Engineering, I-Shou University, Kaohsiung, 84001, Taiwan R.O.C
| |
Collapse
|
20
|
Zhang P, Yuan Y, Gao Z, Li B, Yang G, Song X. Plastic deformation mechanisms in a new Ni-base single crystal superalloy at room temperature. J Microsc 2017; 268:186-192. [PMID: 28722767 DOI: 10.1111/jmi.12597] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 05/01/2017] [Accepted: 06/06/2017] [Indexed: 11/30/2022]
Abstract
The evolution of dislocation configurations in a new Ni-base single crystal superalloy, M4706, during tensile deformation at room temperature is characterised by transmission electron microscopy. Experimental results show that contrary to previous reports, numerous isolated superlattice stacking faults and extended stacking faults are formed in the slightly deformed specimens with and without tertiary γ' precipitates. Meanwhile, it is also found that as the plastic deformation proceeds, the dominant deformation mechanism changes from stacking fault shearing to antiphase boundary shearing. Finally, based on experimental observations, the reasons for the formation of these faults and the transition in the deformation mechanism are discussed.
Collapse
Affiliation(s)
- P Zhang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
| | - Y Yuan
- Xi'an Thermal Power Research Institute Co., Ltd., Xi'an, China
| | - Z Gao
- State Key Laboratory for Long-life High Temperature Materials, Dongfang Turbine Co., Ltd., Deyang, China
| | - B Li
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
| | - G Yang
- State Key Laboratory for Long-life High Temperature Materials, Dongfang Turbine Co., Ltd., Deyang, China
| | - X Song
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
| |
Collapse
|
21
|
Bocchini PJ, Sudbrack CK, Noebe RD, Dunand DC, Seidman DN. Microstructure and Creep Properties of Boron- and Zirconium-Containing Cobalt-based Superalloys. MATERIALS SCIENCE & ENGINEERING. A, STRUCTURAL MATERIALS : PROPERTIES, MICROSTRUCTURE AND PROCESSING 2016; 682:260-269. [PMID: 32020989 PMCID: PMC6999751 DOI: 10.1016/j.msea.2016.10.124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The effects of micro-additions of boron and zirconium on grain-boundary (GB) structure and strength in polycrystalline γ(f.c.c.) plus γ'(L12) strengthened Co-9.5Al-7.5W-X at. % alloys (X = 0-Temary, 0.05B, 0.01B, 0.05Zr, and 0.005B-0.05Zr at. %) are studied. Creep tests performed at 850 °C demonstrate that GB strength and cohesion limit the creep resistance and ductility of the ternary B- and Zr-free alloy due to intergranular fracture. Alloys with 0.05B and 0.005B-0.05Zr both exhibit improved creep strength due to enhanced GB cohesion, compared to the baseline ternary Co-9.5Al-7.5W alloy, but alloys containing 0.01B or 0.05Zr additions displayed no benefit. Atom-probe tomography is utilized to measure GB segregation, where B and Zr are demonstrated to segregate at GBs. A Gibbsian interfacial excess of 5.57 ± 1.04 atoms nm-2 was found for B at a GB in the 0.01B alloy and 2.88 ± 0.81 and 2.40 ± 0.84 atoms nm-2 for B and Zr, respectively, for the 0.005B-0.05Zr alloy. The GBs in the highest B-containing (0.05B) alloy exhibit micrometer-sized boride precipitates with adjacent precipitate denuded-zones (PDZs), whereas secondary precipitation at the GBs is not present in the other four alloys. The 0.05B alloy has the smallest room temperature yield strength, by 6 %, which is attributed to the PDZs, but it exhibits the largest increase in creep strength (with an ~2.5 order of magnitude decrease in the minimum strain rate for a given stress at 850 °C) over the baseline Co-9.5Al-7.5W alloy.
Collapse
Affiliation(s)
- Peter J Bocchini
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
| | - Chantal K Sudbrack
- NASA Glenn Research Center, Materials and Structures Division, 21000 Brookpark Rd., Cleveland, Ohio 44135, USA
| | - Ronald D Noebe
- NASA Glenn Research Center, Materials and Structures Division, 21000 Brookpark Rd., Cleveland, Ohio 44135, USA
| | - David C Dunand
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
- NASA Glenn Research Center, Materials and Structures Division, 21000 Brookpark Rd., Cleveland, Ohio 44135, USA
| | - David N Seidman
- Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
- Northwestern University Center for Atom-Probe Tomography (NUCAPT), 2220 Campus Drive, Evanston, Illinois 60208-3108, USA
| |
Collapse
|
22
|
Transmission Electron Microscopy of a CMSX-4 Ni-Base Superalloy Produced by Selective Electron Beam Melting. METALS 2016. [DOI: 10.3390/met6110258] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
23
|
Ru Y, Li S, Zhou J, Pei Y, Wang H, Gong S, Xu H. Dislocation network with pair-coupling structure in {111} γ/γ' interface of Ni-based single crystal superalloy. Sci Rep 2016; 6:29941. [PMID: 27511822 PMCID: PMC4980694 DOI: 10.1038/srep29941] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 06/24/2016] [Indexed: 11/09/2022] Open
Abstract
The γ/γ' interface dislocation network is reported to improve the high temperature creep resistance of single crystal superalloys and is usually found to deposit in {001} interface. In this work, a new type of dislocation network was found in {111} γ/γ' interface at a single crystal model superalloy crept at 1100 °C/100 MPa. The dislocations in the network are screw with Burgers vectors of 1/2 a<110> and most interestingly, they exhibit a pair-coupling structure. Further investigation indicates that the formation of {111} interface dislocation network occurs when the γ' raft structure begins to degrade by the dislocations cutting into the rafted γ' through the interface. In this condition, the pair-coupling structure is established by the dislocations gliding in a single {111} plane of γ', in order to remove the anti-phase boundary in γ'; these dislocations also act as diffusion channels for dissolving of the γ' particle that is unstable under the interfacial stress from lattice misfit, which leads to the formation of {111}-type zigzag interface. The formation of this network arises as a consequence of more negative misfit, low-alloying γ' particle and proper test conditions of temperature and stress.
Collapse
Affiliation(s)
- Yi Ru
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| | - Shusuo Li
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| | - Jian Zhou
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| | - Yanling Pei
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| | - Hui Wang
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| | - Shengkai Gong
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| | - Huibin Xu
- School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing, 100191, PR China
| |
Collapse
|
24
|
Abstract
X-ray diffraction peak broadening is discussed in terms of line broadening and rocking-curve broadening in a novel theoretical description. The nonlocal strain tensor is factorized by using the method of polar decomposition instead of the more conventional separation into symmetrical and antisymmetrical components. A number of X-ray line-broadening and rocking-curve experiments on the same single crystals or individual grains in bulk polycrystals prove that plastic deformation produces strained subgrains mutually rotated by rigid-body rotations. The novel theoretical description appropriately accounts for the rigid-body rotation and strain at the same time and provides straightforward separation of the two effects of line and rocking-curve broadening in the radial and normal directions of the diffraction vector. The mathematical results are discussed in terms of experiments of X-ray diffraction, Laue asterism and electron backscatter diffraction. From the experimental results it is shown that the simultaneous evaluation of line and rocking-curve broadening provides qualitative information about the redundant and geometrically necessary character of dislocations, not available if only one or the other is accessible.
Collapse
|
25
|
Zhao Y, Zhang H, Wei H, Zheng Q, Jin T, Sun X. Progress of phase-field investigations of γ′ rafting in nickel-base single-crystal superalloys. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s11434-014-0228-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
26
|
Liu C, Wang F, Yuan P, Guo Z, Yu J, Jia Y. Atomistic view of thin Ni/Ni3Al (0 0 1) under uniaxial tension of twist grain boundaries. RSC Adv 2014. [DOI: 10.1039/c3ra45393f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
27
|
Maaß R, Meza L, Gan B, Tin S, Greer JR. Ultrahigh strength of dislocation-free Ni3Al nanocubes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:1869-1875. [PMID: 22454244 DOI: 10.1002/smll.201102603] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Indexed: 05/31/2023]
Abstract
Individual Ni(3) Al nanocubes under pressure are investigated by comparing the compressive strength of both dislocation-free and irradiated Ni(3) Al nanocubes. The results are dicussed in light of the size-dependent and size-independent strength of face-centered cubic (fcc) nanocrystals in the framework of dislocation nucleation at free surfaces. This study sheds more light on the understanding of fundamental deformation mechanisms and size-affected strength in dislocation-free metallic nanocrystals.
Collapse
Affiliation(s)
- Robert Maaß
- California Institute of Technology, Division of Engineering and Applied Sciences, 1200 E California Blvd, Pasadena, CA 91125, USA.
| | | | | | | | | |
Collapse
|
28
|
Kaciulis S, Mezzi A, Amati M, Montanari R, Angella G, Maldini M. Relation between the microstructure and microchemistry in Ni-based superalloy. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.4844] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- S. Kaciulis
- ISMN - CNR; P.O. Box 10; 00015; Montelibretti, Roma; Italy
| | - A. Mezzi
- ISMN - CNR; P.O. Box 10; 00015; Montelibretti, Roma; Italy
| | - M. Amati
- Sincrotrone Trieste; Area Science Park; 34012; Trieste; Italy
| | - R. Montanari
- Dept. of Mechanical Engineering; University of Rome “Tor Vergata”; 00133; Roma; Italy
| | | | | |
Collapse
|
29
|
Dubiel BT, Czyrska-Filemonowicz A. Microstructural changes during creep of CMSX-4 single crystal Ni base superalloy at 750 degrees C. J Microsc 2010; 237:364-9. [PMID: 20500397 DOI: 10.1111/j.1365-2818.2009.03261.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
TEM studies of creep tested CMSX-4 nickel-base single crystal superalloy were performed to analyse a microstructure evolution during creep at temperature 750 degrees C, and uniaxial tensile stress of 675 MPa. Microstructural analyses were focused mainly on examination of dislocation configurations during primary and secondary creep stages of high temperature deformation. At such low temperature and high stress creep deformation proceed by cutting of gamma' particles by dislocations. It was found that primary creep is initiated by movement of dislocations with Burgers vector a/2 <110> in the gamma phase. The second type of dislocations active at primary creep stage are extended dislocation ribbons with overall a<112> Burgers vector, separated by superlattice stacking faults, cutting both the gamma and gamma' phases. The movement of the dislocation ribbons is inhibited at secondary creep stage by dislocation networks formed at gamma-gamma' interfaces.
Collapse
Affiliation(s)
- B T Dubiel
- Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Krakow, Poland.
| | | |
Collapse
|
30
|
Shiba H, Onuki A. Plastic deformations in crystal, polycrystal, and glass in binary mixtures under shear: collective yielding. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2010; 81:051501. [PMID: 20866229 DOI: 10.1103/physreve.81.051501] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Revised: 02/02/2010] [Indexed: 05/29/2023]
Abstract
Using molecular dynamics simulation, we examine the dynamics of crystal, polycrystal, and glass in a Lennard-Jones binary mixture composed of small and large particles in two dimensions. The crossovers occur among these states as the composition c is varied at fixed size ratio. Shear is applied to a system of 9000 particles in contact with moving boundary layers composed of 1800 particles. The particle configurations are visualized with a sixfold orientation angle αj(t) and a disorder variable Dj(t) defined for particle j, where the latter represents the deviation from hexagonal order. Fundamental plastic elements are classified into dislocation gliding and grain boundary sliding. At any c, large-scale yielding events occur on the acoustic time scale. Moreover, they multiply occur in narrow fragile areas, forming shear bands. The dynamics of plastic flow is highly hierarchical with a wide range of time scales for slow shearing. We also clarify the relationship between the shear stress averaged in the bulk region and the wall stress applied at the boundaries.
Collapse
Affiliation(s)
- Hayato Shiba
- Institute for Solid State Physics, University of Tokyo, Chiba 277-8581, Japan
| | | |
Collapse
|
31
|
EPISHIN ALEXANDER, LINK THOMAS, NOLZE GERT. SEM investigation of interfacial dislocations in nickel-base superalloys. J Microsc 2007; 228:110-7. [DOI: 10.1111/j.1365-2818.2007.01831.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
32
|
Dubiel B, Czyrska-Filemonowicz A. Microstructural changes of CM186LC single-crystal superalloy during creep deformation at 750 °C. J Microsc 2006; 224:8-11. [PMID: 17100893 DOI: 10.1111/j.1365-2818.2006.01637.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The microstructure of creep-tested CM186LC Ni-base single-crystal alloy was studied to assess its suitability for use in the gas turbine environment. Creep tests were conducted at 750 degrees C and at stresses of 560 and 675 MPa up to 11 440 h. The microstructure of fractured and terminated specimens was investigated by light microscopy, scanning electron microscopy and analytical transmission electron microscopy. Microstructural analysis revealed the differences in the microstructure of creep-tested CM186LC depending on the stress applied during creep at 750 degrees C.
Collapse
Affiliation(s)
- B Dubiel
- AGH University of Science and Technology, 30-059 Kraków, Al. Mickiewicza 30, Poland.
| | | |
Collapse
|
33
|
Kostka A, Mälzer G, Eggeler G. High-temperature dislocation plasticity in the single-crystal superalloy LEK94. J Microsc 2006; 223:295-7. [PMID: 17059555 DOI: 10.1111/j.1365-2818.2006.01659.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The evolution of the dislocation structure that forms during uniaxial creep deformation in the single-crystal superalloy LEK94 of low density and with Re additions was analysed using transmission electron microscopy. The material has a gamma/gamma'-microstructure consisting of gamma'-cubes (L12 phase, 80 vol.%) separated by thin gamma-channels (face-centred cubic). <100> tensile creep tests were performed at 980 and 1020 degrees C at stresses of 200 and 240 MPa. The microstructure was investigated at three characteristic stages of creep (directly after loading, at 5% strain and after rupture) to show the evolution of the dislocation structure during high-temperature creep. It was found that in the early stages of creep, a(0)/2<011> dislocations form within the gamma-channels. Later on, dislocation networks form and gamma' cutting processes with a(0)/<001> superdislocations are observed. The results are in line with observations made for other superalloy single crystals in the high-temperature low-stress creep regime.
Collapse
Affiliation(s)
- A Kostka
- Institut für Werkstoffe, Ruhr-Universität Bochum, 44780 Bochum, Germany.
| | | | | |
Collapse
|
34
|
Knipling KE, Dunand DC, Seidman DN. Criteria for developing castable, creep-resistant aluminum-based alloys – A review. ACTA ACUST UNITED AC 2006. [DOI: 10.3139/146.101249] [Citation(s) in RCA: 345] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
35
|
Pollock T, Field R. Chapter 63 Dislocations and high-temperature plastic deformation of superalloy single crystals. DISLOCATIONS IN SOLIDS 2002. [DOI: 10.1016/s1572-4859(02)80014-6] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
|
36
|
Brien V, Kubin LP, Decamps B. Low-cycle fatigue of a nickel-based superalloy at high temperature: Simplified micromechanical modelling. ACTA ACUST UNITED AC 2001. [DOI: 10.1080/01418610108217148] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
37
|
Schweinfest R, Köstlmeier S, Ernst F, Elsäser C, Wagner T, Finnis MW. Atomistic and electronic structure of Al/MgAl2O4and Ag/MgAl2O4interfaces. ACTA ACUST UNITED AC 2001. [DOI: 10.1080/01418610151133375] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
38
|
Groen HB, Kooi BJ, Vellinga WP, De Hosson JTM. High-resolution transmission electron microscopy imaging of misfit-dislocation networks at Cu-MgO and Cu-MnO interfaces. ACTA ACUST UNITED AC 1999. [DOI: 10.1080/01418619908210410] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
39
|
Chapter 48 Superalloys (Ni-base) and Dislocations — an Introduction. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s1572-4859(96)80003-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
|
40
|
Ikuhara Y, Pirouz P, Yadavalli S, Flynn CP. Structure of V–MgO and MgO–V interfaces. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/01418619508239589] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
41
|
Vitek V, Gutekunst G, Mayer J, Rühle M. Atomic structure of misfit dislocations in metal‐ceramic interfaces. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/01418619508244370] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
42
|
X-ray investigations on creep-deformed single crystals of the nickel—base superalloy CMSX-4. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0956-7151(94)00407-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
43
|
Kubin LP, Lisiecki B, Caron P. Octahedral slip instabilities in γ/γ' superalloy single crystals CMSX-2 and AM3. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/01418619508236233] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
44
|
A dislocation based criterion for the raft formation in nickel-based superalloys single crystals. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0956-7151(94)00432-h] [Citation(s) in RCA: 117] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
45
|
Kraft S, Altenberger I, Mughrabi H. Directional γ-γ′ coarsening in a monocrystalline nickel-based superalloy during low-cycle thermomechanical fatigue. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/s0956-716x(99)80074-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
46
|
Investigation of γ/γ′ lattice mismatch in the polycrystalline nickel-base superalloy IN738LC: Influence of heat treatment and creep deformation. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0956-7151(94)00252-d] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
47
|
Vallés J, Arrell D. Monte Carlo simulation of anisotropic coarsening in nickel-base superalloys. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0956-7151(94)90396-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
48
|
Pollock T, Argon A. Directional coarsening in nickel-base single crystals with high volume fractions of coherent precipitates. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0956-7151(94)90011-6] [Citation(s) in RCA: 333] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
49
|
Feller-Kniepmeier M, Hemmersmeier U, Kuttner T, Link T. Analysis of interfacial dislocations in a single crystal nickel-base superalloy after [001] creep at 1033K. Evolution of internal stresses. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0956-716x(94)90258-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
50
|
|