Evolution of atomic rearrangements in deformation in metallic glasses

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	Evolution of atomic rearrangements in deformation in metallic glasses
	Shang BS(尚宝双); Li MZ; Yao YG; Lu YJ; Wang WH; Shang, BS (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
发表期刊	PHYSICAL REVIEW E
	2014-10-07
卷号	90 期号:4 页码:42303
ISSN	1539-3755
摘要	Atomic rearrangements induced by shear stress are fundamental for understanding deformation mechanisms in metallic glasses (MGs). Using molecular dynamic simulation, the atomic rearrangements characterized by nonaffine displacements (NADs) and their spatial distribution and evolution with tensile stress in Cu50Zr50 MG were investigated. It was found that in the elastic regime the atomic rearrangements with the largest NADs are relatively homogeneous in space, but exhibit strong spatial correlation, become localized and inhomogeneous, and form large clusters as strain increases, which may facilitate the so-called shear transformation zones. Furthermore, initially they prefer to take place around Cu atoms which have more nonicosahedral configurations. As strain increases, the preference decays and disappears in the plastic regime. The atomic rearrangements with the smallest NADs are preferentially located around Cu atoms, too, but with more icosahedral or icosahedral-like atomic configurations. The preference is maintained in the whole deformation process. In contrast, the atomic rearrangements with moderate NADs distribute homogeneously, and do not show explicit preference or spatial correlation, acting as matrix during deformation. Among the atomic rearrangements with different NADs, those with largest and smallest NADs are nearest neighbors initially, but separating with increasing strain, while those with largest and moderate NADs always avoid to each other. The correlations in the fluctuations of the NADs confirm the long-range strain correlation and the scale-free characteristic of NADs in both elastic and plastic deformation, which suggests a universality of the scaling in the plastic flow in MGs.
学科领域	Physics
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收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000342796200005
项目资助者	This work was supported by NSF of China (Grants No. 51271195, No. 51271197, No. 11021262, No. 11174337, and No. 11225418), National Basic Research Program of China (Grant No. 2012CB937500), the MOST Project of China (Grants No. 2014CB920903, No. 2015CB856800), and the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20121101110046). M.Z.L. was also supported by NCET-11-0498.
论文分区	一类
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/49315
专题	非线性力学国家重点实验室
通讯作者	Shang, BS (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Shang BS,Li MZ,Yao YG,et al. Evolution of atomic rearrangements in deformation in metallic glasses[J]. PHYSICAL REVIEW E,2014,90,4,:42303.
APA	Shang BS,Li MZ,Yao YG,Lu YJ,Wang WH,&Shang, BS .(2014).Evolution of atomic rearrangements in deformation in metallic glasses.PHYSICAL REVIEW E,90(4),42303.
MLA	Shang BS,et al."Evolution of atomic rearrangements in deformation in metallic glasses".PHYSICAL REVIEW E 90.4(2014):42303.

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