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Cheng S, Chakravarty P, Nagapudi K, McKenna GB. Isothermal Crystallization Monitoring and Time–Temperature-Transformation of Amorphous GDC-0276: Differential Scanning Calorimetric and Rheological Measurements. Mol Pharm 2020; 18:158-173. [DOI: 10.1021/acs.molpharmaceut.0c00776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sixue Cheng
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
| | - Paroma Chakravarty
- Small Molecule Pharmaceutical Sciences, Genentech, Inc., South San Francisco, California 94080, United States
| | - Karthik Nagapudi
- Small Molecule Pharmaceutical Sciences, Genentech, Inc., South San Francisco, California 94080, United States
| | - Gregory B. McKenna
- Department of Chemical Engineering, Texas Tech University, Lubbock, Texas 79409-3121, United States
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Du J, Zhang A, Guo Z, Yang M, Li M, Xiong S. Atomistic Determination of Anisotropic Surface Energy-Associated Growth Patterns of Magnesium Alloy Dendrites. ACS OMEGA 2017; 2:8803-8809. [PMID: 31457410 PMCID: PMC6645556 DOI: 10.1021/acsomega.7b01174] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Accepted: 11/23/2017] [Indexed: 06/08/2023]
Abstract
Because of the existence of anisotropic surface energy with respect to the hexagonal close-packed (hcp) lattice structure, magnesium alloy dendrite prefers to grow along certain crystallographic directions and exhibits a complex growth pattern. To disclose the underlying mechanism behind the three-dimensional (3-D) growth pattern of magnesium alloy dendrite, an anisotropy function was developed in light of the spherical harmonics and experimental findings. Relevant atomistic simulations based on density functional theory were then performed to determine the anisotropic surface energy along different crystallographic directions, and the corresponding anisotropic strength was quantified via the least-square regression. Results of phase field simulations showed that the proposed anisotropy function could satisfactorily describe the 3-D growth pattern of the α-Mg dendrite observed in the experiments. Our investigations shed great insight into understanding the pattern formation of the hcp magnesium alloy dendrite at an atomic level.
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Affiliation(s)
- Jinglian Du
- School
of Materials Science and Engineering and Laboratory for Advanced Materials
Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Ang Zhang
- School
of Materials Science and Engineering and Laboratory for Advanced Materials
Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Zhipeng Guo
- School
of Materials Science and Engineering and Laboratory for Advanced Materials
Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Manhong Yang
- School
of Materials Science and Engineering and Laboratory for Advanced Materials
Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Mei Li
- Materials
Research Department, Research and Innovation Center, Ford Motor Company, MD3182, P.O.
Box 2053, Dearborn, Michigan 48121, United States
| | - Shoumei Xiong
- School
of Materials Science and Engineering and Laboratory for Advanced Materials
Processing Technology, Ministry of Education, Tsinghua University, Beijing 100084, China
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3
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Du J, Guo Z, Zhang A, Yang M, Li M, Xiong S. Correlation between crystallographic anisotropy and dendritic orientation selection of binary magnesium alloys. Sci Rep 2017; 7:13600. [PMID: 29051513 PMCID: PMC5648834 DOI: 10.1038/s41598-017-12814-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 09/14/2017] [Indexed: 11/27/2022] Open
Abstract
Both synchrotron X-ray tomography and EBSD characterization revealed that the preferred growth directions of magnesium alloy dendrite change as the type and amount of solute elements. Such growth behavior was further investigated by evaluating the orientation-dependent surface energy and the subsequent crystallographic anisotropy via ab-initio calculations based on density functional theory and hcp lattice structure. It was found that for most binary magnesium alloys, the preferred growth direction of the α-Mg dendrite in the basal plane is always \documentclass[12pt]{minimal}
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\begin{document}$$\langle 22\bar{4}5\rangle $$\end{document}〈224¯5〉 as the Al-concentration increased, and for Mg-Zn alloys, this direction changes from \documentclass[12pt]{minimal}
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\begin{document}$$\langle 11\bar{2}2\rangle $$\end{document}〈112¯2〉 as the Zn-content varied. Our results provide a better understanding on the dendritic orientation selection and morphology transition of magnesium alloys at the atomic level.
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Affiliation(s)
- Jinglian Du
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.,Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Zhipeng Guo
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China. .,Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China.
| | - Ang Zhang
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.,Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Manhong Yang
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.,Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China
| | - Mei Li
- Materials Research Department, Research and Innovation Center, Ford Motor Company, MD3182, P.O Box 2053, Dearborn, MI48121, USA
| | - Shoumei Xiong
- School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China. .,Laboratory for Advanced Materials Processing Technology, Ministry of Education, Tsinghua University, Beijing, 100084, China.
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Marefati M, Hadian A, Hooshmand T, Hadian A, Yekta BE. Wetting Characteristics of a Nano Y-TZP Dental Ceramic by a Molten Feldspathic Veneer. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.mspro.2015.11.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Angioletti-Uberti S. The solid-liquid interface free-energy of Pb: comparison of theory and experiments. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:435008. [PMID: 21983219 DOI: 10.1088/0953-8984/23/43/435008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The solid-liquid interface free-energy γ(sl) is a key parameter controlling nucleation and growth during solidification and other phenomena. Different experimental techniques are available for its evaluation but results are often widely scattered and strongly depend on the technique used. One of the best examples in this sense is the case of elemental Pb, with values for γ(sl) differing by as much as 150% between nucleation rate experiments and contact angle data. Even using simple many-body potentials, theoretical calculations of γ(sl) can exceed this level of accuracy and thus be employed to assess the present experimental data. To this purpose, atomistic calculations are performed in conjunction with two different many-body potentials for Pb. These show good agreement with nucleation rate and depression of melting point experiments and support the case for a reassessment of the measurements reported from contact angle data. Possible sources of errors that might have affected these experiments are critically discussed, showing how the magnitude of the anisotropy in the interfacial free energies can be important in closing the gap between the different sets of experimental data.
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Skinner TOE, Aarts DGAL, Dullens RPA. Grain-boundary fluctuations in two-dimensional colloidal crystals. PHYSICAL REVIEW LETTERS 2010; 105:168301. [PMID: 21231020 DOI: 10.1103/physrevlett.105.168301] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Indexed: 05/30/2023]
Abstract
We study grain-boundary fluctuations in two-dimensional colloidal crystals in real space and time using video microscopy. The experimentally obtained static and dynamic correlation functions are very well described by expressions obtained using capillary wave theory. This directly leads to values for the interfacial stiffness and the interface mobility, the key parameters in curvature-driven grain-boundary migration. Furthermore, we show that the average grain-boundary position exhibits a one-dimensional random walk as recently suggested by computer simulations [Z. T. Trautt, M. Upmanyu, and A. Karma, Science 314, 632 (2006)]. The interface mobility determined from the mean-square displacement of the average grain-boundary position is in good agreement with values inferred from grain-boundary fluctuations.
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Affiliation(s)
- Thomas O E Skinner
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom.
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