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Peng Z, Chen Y, Yin G, Gong P, Jamili-Shirvan Z, Li N, Wang X, Yao K. Effect of cryogenic cycling on mechanical properties of ZrTiCuNiBe bulk metallic glass. FUNDAMENTAL RESEARCH 2022; 2:764-775. [PMID: 38933124 PMCID: PMC11197655 DOI: 10.1016/j.fmre.2021.11.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 11/15/2021] [Accepted: 11/22/2021] [Indexed: 11/18/2022] Open
Abstract
The effect of deep cryogenic cycle treatment (DCT) on Zr41.2Ti13.8Cu12.5Ni10Be22.5 (Vit-1) bulk metallic glass (BMG) prepared from high-purity raw materials was investigated. After DCT, no obvious rejuvenation of the samples was detected. With an increasing number of cryogenic cycles, the hardness of the samples first decreased and then increased, the room-temperature compression plasticity first increased and then generally remained unchanged, and the impact toughness underwent almost no obvious change. The absence of rejuvenation was attributed to the high fragility index (47-50) and high glass forming ability (GFA) of the material. As lower purity of the raw materials is expected in practical applications, DCT of Vit-1 BMG prepared from low-purity raw materials was also performed. After DCT, the samples prepared with the lower-purity raw materials were clearly rejuvenated, and the room-temperature mechanical properties improved significantly.Both the compression plasticity and impact toughness reached peak values after 5 cryogenic cycles. The initial impurities (including Y and O) had a complex and comprehensive effect on the deformation mechanism of the BMG during DCT. Our findings indicate that the structural heterogeneity, fragility index, and GFA of the BMG alter the effect of DCT.
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Affiliation(s)
- Zhen Peng
- School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Yumei Chen
- School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Geng Yin
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
| | - Pan Gong
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
- Research Institue of Huazhong University of Science and Technology in Shenzhen, Shenzhen 518057, China
| | | | - Ning Li
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
| | - Xinyun Wang
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road, Wuhan 430074, China
| | - Kefu Yao
- School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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2
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Extra plasticity governed by shear band deflection in gradient metallic glasses. Nat Commun 2022; 13:2120. [PMID: 35440578 PMCID: PMC9018681 DOI: 10.1038/s41467-022-29821-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 03/22/2022] [Indexed: 11/27/2022] Open
Abstract
Inspired by gradient materials in nature, advanced engineering components with controlled structural gradients have attracted substantial research interests due to their exceptional combinations of properties. However, it remains challenging to generate structural gradients that penetrate through bulk materials, which is essential for achieving enhanced mechanical properties in metallic materials. Here, we report practical strategies to design controllable structural gradients in bulk metallic glasses (BMGs). By adjusting processing conditions, including holding time and/or controlling temperatures, of cryogenic thermal cycling and fast cooling, two different types of gradient metallic glasses (GMGs) with spatially gradient-distributed free volume contents can be synthesized. Both mechanical testing and atomistic simulations demonstrate that the spatial gradient can endow GMGs with extra plasticity. Such an enhanced mechanical property is governed by the gradient-induced deflection of shear deformation that fundamentally suppresses the unlimited shear localization on a straight plane that would be expected in BMGs without such a gradient. Materials with controlled structural gradient have gained attention due to their unique combinations of properties. Here the authors report strategies to design controllable gradients in bulk metallic glasses, demonstrating extra plasticity and suppression of shear localization.
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3
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Zhang M, Qu G, Liu J, Pang M, Wang X, Liu R, Cao G, Ma G. Enhancement of Magnetic and Tensile Mechanical Performances in Fe-Based Metallic Microwires Induced by Trace Ni-Doping. MATERIALS (BASEL, SWITZERLAND) 2021; 14:3589. [PMID: 34199094 PMCID: PMC8269733 DOI: 10.3390/ma14133589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 06/18/2021] [Accepted: 06/22/2021] [Indexed: 11/22/2022]
Abstract
Herein, the effect of Ni-doping amount on microstructure, magnetic and mechanical properties of Fe-based metallic microwires was systematically investigated further to reveal the influence mechanism of Ni-doping on the microstructure and properties of metallic microwires. Experimental results indicate that the rotated-dipping Fe-based microwires structure is an amorphous and nanocrystalline biphasic structure; the wire surface is smooth, uniform and continuous, without obvious macro- and micro-defects that have favorable thermal stability; and moreover, the degree of wire structure order increases with an increase in Ni-doping amount. Meanwhile, FeSiBNi2 microwires possess the better softly magnetic properties than the other wires with different Ni-doping, and their main magnetic performance indexes of Ms, Mr, Hc and μm are 174.06 emu/g, 10.82 emu/g, 33.08 Oe and 0.43, respectively. Appropriate Ni-doping amount can effectively improve the tensile strength of Fe-based microwires, and the tensile strength of FeSiBNi3 microwires is the largest of all, reaching 2518 MPa. Weibull statistical analysis also indicates that the fracture reliability of FeSiBNi2 microwires is much better and its fracture threshold value σu is 1488 MPa. However, Fe-based microwires on macroscopic exhibit the brittle fracture feature, and the angle of sideview fracture θ decreases as Ni-doping amount increases, which also reveals the certain plasticity due to a certain amount of nanocrystalline in the microwires structure, also including a huge amount of shear bands in the sideview fracture and a few molten drops in the cross-section fracture. Therefore, Ni-doped Fe-based metallic microwires can be used as the functional integrated materials in practical engineering application as for their unique magnetic and mechanical performances.
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Affiliation(s)
- Mingwei Zhang
- School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; (M.Z.); (G.Q.); (M.P.); (R.L.); (G.M.)
| | - Guanda Qu
- School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; (M.Z.); (G.Q.); (M.P.); (R.L.); (G.M.)
| | - Jingshun Liu
- School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; (M.Z.); (G.Q.); (M.P.); (R.L.); (G.M.)
| | - Mengyao Pang
- School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; (M.Z.); (G.Q.); (M.P.); (R.L.); (G.M.)
| | - Xufeng Wang
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100022, China;
| | - Rui Liu
- School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; (M.Z.); (G.Q.); (M.P.); (R.L.); (G.M.)
| | - Guanyu Cao
- School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
| | - Guoxi Ma
- School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; (M.Z.); (G.Q.); (M.P.); (R.L.); (G.M.)
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4
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Yu L, Wang TC. Generalized Mohr-Coulomb strain criterion for bulk metallic glasses under complex compressive loading. Sci Rep 2019; 9:12554. [PMID: 31467352 PMCID: PMC6715711 DOI: 10.1038/s41598-019-49085-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 08/19/2019] [Indexed: 11/09/2022] Open
Abstract
The Mohr-Coulomb (M-C) stress criterion is widely applied to describe the pressure sensitivity of bulk metallic glasses (BMGs). However, this criterion is incapable of predicting the variation in fracture angles under different loading modes. Moreover, the M-C criterion cannot describe the plastic fracture of BMGs under compressive loading because the nominal stress of most BMGs remains unchanged after the materials yield. Based on these limitations, we propose a new generalized M-C strain criterion and apply it to analyze the fracture behaviors of two typical Zr-based BMG round bar specimens under complex compressive loading. In this case, the predicted initial yielding stress is in good agreement with the experimental results. The theoretical results can also describe the critical shear strain and fracture angle of BMGs that are associated with the deformation mode.
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5
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Understanding the Fracture Behaviors of Metallic Glasses—An Overview. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9204277] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Fracture properties are crucial for the applications of structural materials. The fracture behaviors of crystalline alloys have been systematically investigated and well understood. The fracture behaviors of metallic glasses (MGs) are quite different from that of conventional crystalline alloys and have drawn wide interests. Although a few reviews on the fracture and mechanical properties of metallic glasses have been published, an overview on how and why metallic glasses fall out of the scope of the conventional fracture mechanics is still needed. This article attempts to clarify the up-to-date understanding of the question. We review the fracture behaviors of metallic glasses with the related scientific issues including the mode I fracture, brittle fracture, super ductile fracture, impact toughness, and fatigue fracture behaviors. The complex fracture mechanism of MGs is further discussed from the perspectives of discontinuous stress/strain field, plastic zone, and fracture resistance, which deviate from the classic fracture mechanics in polycrystalline alloys. Due to the special deformation mechanism, metallic glasses show a high variability in fracture toughness and other mechanical properties. The outlook presented by this review could help the further studies of metallic glasses. The review also identifies some key questions to be answered.
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6
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Zhang L, Wang S. Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1795. [PMID: 30248909 PMCID: PMC6213392 DOI: 10.3390/ma11101795] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 09/18/2018] [Accepted: 09/19/2018] [Indexed: 12/29/2022]
Abstract
Although X-rays generated from a laboratory-based tube cannot be compared with synchrotron radiation in brilliance and monochromaticity, they are still viable and accessible in-house for ex situ or interrupted in situ X-ray tomography. This review mainly demonstrates recent works using laboratory X-ray tomography coupled with the measurements of properties or performance testing under various conditions, such as thermal, stress, or electric fields. Evolvements of correlated internal structures for some typical materials were uncovered. The damage features in a graded metallic 3D mesh and a metallic glass under mechanical loading were revealed and investigated. Micro-voids with thermal treatment and void healing phenomenon with electropulsing were clearly demonstrated and quantitatively analyzed. The substance transfer around an electrode of a Li-S battery and the protective performance of a Fe-based metallic glass coating on stainless steel were monitored through electrochemical processes. It was shown that in situ studies of the laboratory X-ray tomography were suitable for the investigation of structure change under controlled conditions and environments. An extension of the research for in situ laboratory X-ray tomography can be expected with supplementary novel techniques for internal strain, global 3D grain orientation, and a fast tomography strategy.
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Affiliation(s)
- Lei Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
| | - Shaogang Wang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
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7
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Tensile Creep Characterization and Prediction of Zr-Based Metallic Glass at High Temperatures. METALS 2018. [DOI: 10.3390/met8060457] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Scudino S, Bian JJ, Shakur Shahabi H, Şopu D, Sort J, Eckert J, Liu G. Ductile bulk metallic glass by controlling structural heterogeneities. Sci Rep 2018; 8:9174. [PMID: 29907778 PMCID: PMC6003957 DOI: 10.1038/s41598-018-27285-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Accepted: 05/31/2018] [Indexed: 11/09/2022] Open
Abstract
A prerequisite to utilize the full potential of structural heterogeneities for improving the room-temperature plastic deformation of bulk metallic glasses (BMGs) is to understand their interaction with the mechanism of shear band formation and propagation. This task requires the ability to artificially create heterogeneous microstructures with controlled morphology and orientation. Here, we analyze the effect of the designed heterogeneities generated by imprinting on the tensile mechanical behavior of the Zr52.5Ti5Cu18Ni14.5Al10 BMG by using experimental and computational methods. The imprinted material is elastically heterogeneous and displays anisotropic mechanical properties: strength and ductility increase with increasing the loading angle between imprints and tensile direction. This behavior occurs through shear band branching and their progressive rotation. Molecular dynamics and finite element simulations indicate that shear band branching and rotation originates at the interface between the heterogeneities, where the characteristic atomistic mechanism responsible for shear banding in a homogeneous glass is perturbed.
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Affiliation(s)
- S Scudino
- IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069, Dresden, Germany.
| | - J J Bian
- State Key Laboratory for Mechanical Behaviors of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
| | - H Shakur Shahabi
- IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069, Dresden, Germany.,Heraeus Amorphous Metals, Heraeus Deutschland GmbH & Co. KG, Heraeusstrasse 12 - 14, D-63450, Hanau, Germany
| | - D Şopu
- IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069, Dresden, Germany.,Institut für Materialwissenschaft, Technische Universität Darmstadt, Otto-Berndt-Strasse 3, Darmstadt, D-64287, Germany.,Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700, Leoben, Austria
| | - J Sort
- Departament de Física, Universitat Autònoma de Barcelona, E-08193, Bellaterra, Spain.,Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, E-08010, Barcelona, Spain
| | - J Eckert
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700, Leoben, Austria.,Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700, Leoben, Austria
| | - G Liu
- State Key Laboratory for Mechanical Behaviors of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China
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9
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Abstract
Strain hardening, originating from defects such as the dislocation, avails conventional metals of high engineering reliability in applications. However, the hardenability of metallic glass is a long-standing concern due to the lack of similar defects. In this work, we carefully examine the stress-strain relationship in three bulk monolithic metallic glasses. The results show that hardening is surely available in metallic glasses if the effective load-bearing area is considered instantly. The hardening is proposed to result from the remelting and ensuing solidification of the shear-band material under a hydrostatic pressure imposed by the normal stress during the shear banding event. This applied-pressure quenching densifies the metallic glass by discharging the free volume. On the other hand, as validated by molecular dynamics simulations, the pressure promotes the icosahedral short-range order. The densification and icosahedral clusters both contribute to the increase of the shear strength and therefore the hardening in metallic glasses.
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10
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Wang T, Wang L, Wang Q, Liu Y, Hui X. Pronounced Plasticity Caused by Phase Separation and β-relaxation Synergistically in Zr-Cu-Al-Mo Bulk Metallic Glasses. Sci Rep 2017; 7:1238. [PMID: 28450711 PMCID: PMC5430678 DOI: 10.1038/s41598-017-01283-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 03/27/2017] [Indexed: 11/09/2022] Open
Abstract
Bulk metallic glasses (BMGs) are known to have extraordinary merits such as ultrahigh strength and dynamic toughness etc. but tied to the detrimental brittleness, which has become a critical issue to the engineering application and understanding the glass nature. In this article, we report a new class of Zr-Cu-Al-Mo BMGs with extraordinary plastic strain above 20%. "Work-hardening" effect after yielding in a wide range of plastic deformation process has been detected for this kind of BMGs. Compositional heterogeneity, which can be classified into ZrMo- and Cu-rich zones, was differentiated in this kind of BMG. Pronounced humps have been observed on the high frequency kinetic spectrum in Mo containing BMGs, which is the indicator of β-relaxation transition. The underlying mechanism for the excellent plastic deforming ability of this class of BMGs is ascribed to the synergistic effects of soft ZrMo-rich glass formed through phase separation and abundant flow units which related to β-relaxation.
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Affiliation(s)
- Tuo Wang
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Lu Wang
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Qinjia Wang
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yanhui Liu
- Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xidong Hui
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.
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11
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Qu RT, Zhang ZJ, Zhang P, Liu ZQ, Zhang ZF. Generalized energy failure criterion. Sci Rep 2016; 6:23359. [PMID: 26996781 PMCID: PMC4800311 DOI: 10.1038/srep23359] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 03/04/2016] [Indexed: 11/23/2022] Open
Abstract
Discovering a generalized criterion that can predict the mechanical failure of various different structural materials is one of ultimate goals for scientists in both material and mechanics communities. Since the first study on the failure criterion of materials by Galileo, about three centuries have passed. Now we eventually find the “generalized energy criterion”, as presented here, which appears to be one universal law for various different kinds of materials. The validity of the energy criterion for quantitatively predicting the failure is experimentally confirmed using a metallic glass. The generalized energy criterion reveals the competition and interaction between shear and cleavage, the two fundamental inherent failure mechanisms, and thus provides new physical insights into the failure prediction of materials and structural components.
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Affiliation(s)
- R T Qu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China
| | - Z J Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China
| | - P Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China
| | - Z Q Liu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China
| | - Z F Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. China
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12
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Macroscopic tensile plasticity by scalarizating stress distribution in bulk metallic glass. Sci Rep 2016; 6:21929. [PMID: 26902264 PMCID: PMC4763289 DOI: 10.1038/srep21929] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/02/2016] [Indexed: 11/08/2022] Open
Abstract
The macroscopic tensile plasticity of bulk metallic glasses (BMGs) is highly desirable for various engineering applications. However, upon yielding, plastic deformation of BMGs is highly localized into narrow shear bands and then leads to the "work softening" behaviors and subsequently catastrophic fracture, which is the major obstacle for their structural applications. Here we report that macroscopic tensile plasticity in BMG can be obtained by designing surface pore distribution using laser surface texturing. The surface pore array by design creates a complex stress field compared to the uniaxial tensile stress field of conventional glassy specimens, and the stress field scalarization induces the unusual tensile plasticity. By systematically analyzing fracture behaviors and finite element simulation, we show that the stress field scalarization can resist the main shear band propagation and promote the formation of larger plastic zones near the pores, which undertake the homogeneous tensile plasticity. These results might give enlightenment for understanding the deformation mechanism and for further improvement of the mechanical performance of metallic glasses.
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13
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An improved tensile deformation model for in-situ dendrite/metallic glass matrix composites. Sci Rep 2015; 5:13964. [PMID: 26354724 PMCID: PMC4564819 DOI: 10.1038/srep13964] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 08/11/2015] [Indexed: 11/08/2022] Open
Abstract
With regard to previous tensile deformation models simulating the tensile behavior of in-situ dendrite-reinforced metallic glass matrix composites (MGMCs) [Qiao et al., Acta Mater. 59 (2011) 4126; Sci. Rep. 3 (2013) 2816], some parameters, such as yielding strength of the dendrites and glass matrix, and the strain-hardening exponent of the dendrites, are estimated based on literatures. Here, Ti48Zr18V12Cu5Be17 MGMCs are investigated in order to improve the tensile deformation model and reveal the tensile deformation mechanisms. The tensile behavior of dendrites is obtained experimentally combining nano-indentation measurements and finite-element-method analysis for the first time, and those of the glass matrix and composites are obtained by tension. Besides, the tensile behavior of the MGMCs is divided into four stages: (1) elastic-elastic, (2) elastic-plastic, (3) plastic-plastic (work-hardening), and (4) plastic-plastic (softening). The respective constitutive relationships at different deformation stages are quantified. The calculated results coincide well with the experimental results. Thus, the improved model can be applied to clarify and predict the tensile behavior of the MGMCs.
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14
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Influence of Stress-strain on the Microstructural Change in the Metallic Glass and Metallic Glass Matrix Composite. Appl Microsc 2015. [DOI: 10.9729/am.2015.45.2.44] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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15
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Joo SH, Pi DH, Setyawan ADH, Kato H, Janecek M, Kim YC, Lee S, Kim HS. Work-hardening induced tensile ductility of bulk metallic glasses via high-pressure torsion. Sci Rep 2015; 5:9660. [PMID: 25905686 PMCID: PMC5386117 DOI: 10.1038/srep09660] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Accepted: 03/13/2015] [Indexed: 11/09/2022] Open
Abstract
The mechanical properties of engineering materials are key for ensuring safety and reliability. However, the plastic deformation of BMGs is confined to narrow regions in shear bands, which usually result in limited ductilities and catastrophic failures at low homologous temperatures. The quasi-brittle failure and lack of tensile ductility undercut the potential applications of BMGs. In this report, we present clear tensile ductility in a Zr-based BMG via a high-pressure torsion (HPT) process. Enhanced tensile ductility and work-hardening behavior after the HPT process were investigated, focusing on the microstructure, particularly the changed free volume, which affects deformation mechanisms (i.e., initiation, propagation, and obstruction of shear bands). Our results provide insights into the basic functions of hydrostatic pressure and shear strain in the microstructure and mechanical properties of HPT-processed BMGs.
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Affiliation(s)
- Soo-Hyun Joo
- Center for Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea
| | - Dong-Hai Pi
- Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea
| | | | - Hidemi Kato
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Milos Janecek
- Department of Metal Physics, Charles University, 121 16 Prague 2, Czech Republic
| | - Yong Chan Kim
- Research Institute of Industrial Science &Technology, Pohang 790-600, South Korea
| | - Sunghak Lee
- 1] Center for Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea [2] Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea
| | - Hyoung Seop Kim
- 1] Center for Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784, South Korea [2] Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea
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16
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Vincent S, Murty B, Kramer M, Bhatt J. Micro and nano indentation studies on Zr60Cu10Al15Ni15 bulk metallic glass. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.matdes.2014.09.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Abstract
Recently developed advanced high-strength materials like metallic glasses, nanocrystalline metallic materials, and advanced ceramics usually fracture in a catastrophic brittle manner, which makes it quite essential to find a reasonable fracture criterion to predict their brittle failure behaviors. Based on the analysis of substantial experimental observations of fracture behaviors of metallic glasses and other high-strength materials, here we developed a new fracture criterion and proved it effective in predicting the critical fracture conditions under complex stress states. The new criterion is not only a unified one which unifies the three classical failure criteria, i.e., the maximum normal stress criterion, the Tresca criterion and the Mohr-Coulomb criterion, but also a universal criterion which has the ability to describe the fracture mechanisms of a variety of different high-strength materials under various external loading conditions.
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18
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Comparative Study of Elastoplastic Constitutive Models for Deformation of Metallic Glasses. METALS 2012. [DOI: 10.3390/met2040488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Qiu F, Shen P, Liu T, Jiang Q. Enhanced ductility in a Zr65Cu15Al10Ni10 bulk metallic glass by nanocrystallization during compression. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.matdes.2011.10.034] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Lingchen Z, Dongmei X, Taihua Z, Bingchen W, Weihuo L, Yuren W. Deformation behavior during nanoindentation in Ce-based bulk metallic glasses. CHINESE SCIENCE BULLETIN-CHINESE 2006. [DOI: 10.1007/s11434-006-2013-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Zhang H, Pan XF, Zhang ZF, Das J, Kim KB, Müller C, Baier F, Kusy M, Gebert A, He G, Eckert J. Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites. ACTA ACUST UNITED AC 2005. [DOI: 10.3139/146.101087] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Das J, Tang MB, Kim KB, Theissmann R, Baier F, Wang WH, Eckert J. "Work-Hardenable" ductile bulk metallic glass. PHYSICAL REVIEW LETTERS 2005; 94:205501. [PMID: 16090260 DOI: 10.1103/physrevlett.94.205501] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2005] [Indexed: 05/03/2023]
Abstract
Usually, monolithic bulk metallic glasses undergo inhomogeneous plastic deformation and exhibit poor ductility (< 1%) at room temperature. We present a new class of bulk metallic glass, which exhibits high strength of up to 2265 MPa together with extensive "work hardening" and large ductility of 18%. Significant increase in the flow stress was observed during deformation. The "work-hardening" capability and ductility of this class of metallic glass is attributed to a unique structure correlated with atomic-scale inhomogeneity, leading to an inherent capability of extensive shear band formation, interactions, and multiplication of shear bands.
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Affiliation(s)
- Jayanta Das
- FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstrasse 23, D-64287 Darmstadt, Germany
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Xi XK, Zhao DQ, Pan MX, Wang WH, Wu Y, Lewandowski JJ. Fracture of brittle metallic glasses: brittleness or plasticity. PHYSICAL REVIEW LETTERS 2005; 94:125510. [PMID: 15903937 DOI: 10.1103/physrevlett.94.125510] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2004] [Indexed: 05/02/2023]
Abstract
We report a brittle Mg-based bulk metallic glass which approaches the ideal brittle behavior. However, a dimple structure is observed at the fracture surface by high resolution scanning electron microscopy, indicating some type of "ductile" fracture mechanism in this very brittle glass. We also show, from the available data, a clear correlation between the fracture toughness and plastic process zone size for various glasses. The results indicate that the fracture in brittle metallic glassy materials might also proceed through the local softening mechanism but at different length scales.
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Affiliation(s)
- X K Xi
- Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
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Zhang ZF, Eckert J. Unified tensile fracture criterion. PHYSICAL REVIEW LETTERS 2005; 94:094301. [PMID: 15783967 DOI: 10.1103/physrevlett.94.094301] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2004] [Indexed: 05/24/2023]
Abstract
We find that the classical failure criteria, i.e., maximum normal stress criterion, Tresca criterion, Mohr-Coulomb criterion, and von Mises criterion, cannot satisfactorily explain the tensile fracture behavior of the bulk metallic glass (BMG) materials. For a better description, we propose an ellipse criterion as a new failure criterion to unify the four classical criteria above and apply it to exemplarily describe the tensile fracture behavior of BMGs as well as a variety of other materials. It is suggested that each of the classical failure criteria can be unified by the present ellipse criterion depending on the difference of the ratio alpha=tau(0)/sigma(0).
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Affiliation(s)
- Z F Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, People's Republic of China.
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