Microstructure evolution during near- annealing and its effect on shear banding in model alloys
Abstract
By performing extensive molecular dynamics simulations, we investigate herein the deformation behavior in and alloys after elongated isothermal annealing in the vicinity of the glass-transition temperature ( ). Different microstructural response to the annealing process was observed: maintains the glassy structure with improved energetic stability, enhanced short-range order (SRO), and a more pronounced spatial network that extends beyond the first atomic shell, while forms nanocrystalline Laves phases. Shear banding occurs in both annealed systems under shear loading. For , the spatial network formed by the local clusters characterizing the SRO of the system is significantly weakened but remains appreciable in the shear band. In contrast, the crystalline ordering in the is completely destroyed during shear banding. Consequently, while displaying higher yield strength, the annealed sample appears to be less ductile. By carefully examining the effect of microstructures on the structural ordering in the shear band and the consequent mechanical response, our work contributes to a better understanding of the deformation mechanism of amorphous alloys as compared with that in crystalline materials.
- Authors:
-
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Tsinghua Univ., Beijing (China)
- China State Shipbuilding Corporation Limited, Beijing (China). Systems Engineering Research Inst.
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1599169
- Report Number(s):
- IS-J-10103
Journal ID: ISSN 2475-9953; PRMHAR; TRN: US2103435
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 12; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Yang, Meng-Hao, Cai, Bei, Sun, Yang, Zhang, Feng, Wang, Yi-Fan, Wang, Cai-Zhuang, and Ho, Kai-Ming. Microstructure evolution during near-Tg annealing and its effect on shear banding in model alloys. United States: N. p., 2019.
Web. doi:10.1103/PhysRevMaterials.3.125602.
Yang, Meng-Hao, Cai, Bei, Sun, Yang, Zhang, Feng, Wang, Yi-Fan, Wang, Cai-Zhuang, & Ho, Kai-Ming. Microstructure evolution during near-Tg annealing and its effect on shear banding in model alloys. United States. https://doi.org/10.1103/PhysRevMaterials.3.125602
Yang, Meng-Hao, Cai, Bei, Sun, Yang, Zhang, Feng, Wang, Yi-Fan, Wang, Cai-Zhuang, and Ho, Kai-Ming. Mon .
"Microstructure evolution during near-Tg annealing and its effect on shear banding in model alloys". United States. https://doi.org/10.1103/PhysRevMaterials.3.125602. https://www.osti.gov/servlets/purl/1599169.
@article{osti_1599169,
title = {Microstructure evolution during near-Tg annealing and its effect on shear banding in model alloys},
author = {Yang, Meng-Hao and Cai, Bei and Sun, Yang and Zhang, Feng and Wang, Yi-Fan and Wang, Cai-Zhuang and Ho, Kai-Ming},
abstractNote = {By performing extensive molecular dynamics simulations, we investigate herein the deformation behavior in Al90Sm10 and Cu64.5Zr35.5 alloys after elongated isothermal annealing in the vicinity of the glass-transition temperature (Tg). Different microstructural response to the annealing process was observed: Al90Sm10 maintains the glassy structure with improved energetic stability, enhanced short-range order (SRO), and a more pronounced spatial network that extends beyond the first atomic shell, while Cu64.5Zr35.5 forms nanocrystalline Laves Cu2Zr phases. Shear banding occurs in both annealed systems under shear loading. For Al90Sm10, the spatial network formed by the local clusters characterizing the SRO of the system is significantly weakened but remains appreciable in the shear band. In contrast, the crystalline ordering in the Cu64.5Zr35.5 is completely destroyed during shear banding. Consequently, while displaying higher yield strength, the annealed Cu64.5Zr35.5 sample appears to be less ductile. By carefully examining the effect of microstructures on the structural ordering in the shear band and the consequent mechanical response, our work contributes to a better understanding of the deformation mechanism of amorphous alloys as compared with that in crystalline materials.},
doi = {10.1103/PhysRevMaterials.3.125602},
journal = {Physical Review Materials},
number = 12,
volume = 3,
place = {United States},
year = {2019},
month = {12}
}
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