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Fundamental links between shear transformation, fi relaxation, and string-like motion in metallic glasses

文献类型：期刊论文

作者Zhou, ZhenYa; Sun, Yang; Gao, Liang; Wang YJ(王云江); Yu, HaiBin
刊名ACTA MATERIALIA
出版日期2023-03-01
卷号246页码:11
关键词Metallic glasses Plastic deformation relaxation String-like motion Accelerated molecular dynamics
ISSN号1359-6454
DOI10.1016/j.actamat.2023.118701
通讯作者Wang, Yun-Jiang(yjwang@imech.ac.cn) ; Yu, Hai-Bin(haibinyu@hust.edu.cn)
英文摘要Plastic deformation and relaxation dynamics are two major topics in glass physics. Secondary (fi) relaxation has been assumed to be a relevant plastic mechanism in amorphous solids, e.g., metallic glasses (MGs), at the macroscopic scale. However, due to the constraints of the time scale of traditional computer simulation, it is still an open question whether the correlation can be justified at the atomic level, or is it just a correlation in a mean-field sense? In this work, molecular dynamics simulations augmented with metadynamics are conducted to study the basic atomic rearrangement mechanism up to experimentally relevant timescales (up to milliseconds). We show that in a unique Al90Sm10 MG with pronounced fi relaxation, the atoms initiating the plastic deformation are exactly the ones apt to develop string-like cooperative motions, as expected from the perspective of fi relaxation. For a Y65Cu35MG without obvious fi relaxation, string-like motions are rarely observed in the deformation of participating atoms, although their atomic displacements are also aligned in a correlative manner. Therefore, our laboratory long-time-scale observation enables the in situ construction of a fundamental link among the versatile concepts of shear transformation, fi relaxation, and string-like motion in amorphous materials.
分类号一类
WOS关键词IMPLEMENTING MOLECULAR-DYNAMICS ; MECHANICAL-BEHAVIOR ; ELASTIC PROPERTIES ; AMORPHOUS SOLIDS ; DEFORMATION ; TRANSITION ; PLASTICITY ; DIFFUSION ; STRENGTH ; DEFECTS
资助项目Na-tional Thousand Young Talents Program of China ; public computing service platform by Network and Computing Center of HUST, China ; National Science Foundation of China[NSFC 52071147] ; National Science Foundation of China[51601064] ; National Science Foundation of China[12072344] ; National Thousand Young Talents Program of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Ningxia Natural Science Foundation, China[2022AAC03066] ; Ningxia Key Research and Development Program, China[2020BEB04026]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000923686200001
资助机构Na-tional Thousand Young Talents Program of China ; public computing service platform by Network and Computing Center of HUST, China ; National Science Foundation of China ; National Thousand Young Talents Program of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Ningxia Natural Science Foundation, China ; Ningxia Key Research and Development Program, China
其他责任者Wang, Yun-Jiang ; Yu, Hai-Bin
源URL[http://dspace.imech.ac.cn/handle/311007/91622]  
专题力学研究所_非线性力学国家重点实验室
推荐引用方式
GB/T 7714		 Zhou, ZhenYa,Sun, Yang,Gao, Liang,et al. Fundamental links between shear transformation, fi relaxation, and string-like motion in metallic glasses[J]. ACTA MATERIALIA,2023,246:11.
APA Zhou, ZhenYa,Sun, Yang,Gao, Liang,王云江,&Yu, HaiBin.(2023).Fundamental links between shear transformation, fi relaxation, and string-like motion in metallic glasses.ACTA MATERIALIA,246,11.
MLA Zhou, ZhenYa,et al."Fundamental links between shear transformation, fi relaxation, and string-like motion in metallic glasses".ACTA MATERIALIA 246(2023):11.

入库方式： OAI收割

来源：力学研究所

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