Strain gradient drives shear banding in metallic glasses

doi:10.1103/PhysRevB.96.094103

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	Strain gradient drives shear banding in metallic glasses
	Tian, Zhi-Li; Wang YJ(王云江); Chen Y(陈艳); Dai LH(戴兰宏); Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
发表期刊	PHYSICAL REVIEW B
	2017-09-06
卷号	96 期号:9
ISSN	2469-9950
摘要	Shear banding is a nucleation-controlled process in metallic glasses (MGs) involving multiple temporal-spatial scales, which hinders a concrete understanding of its structural origin down to the atomic scale. Here, inspired by the morphology of composite materials, we propose a different perspective of MGs as a hard particle-reinforced material based on atomic-scale structural heterogeneity. The local stable structures indicated by a high level of local fivefold symmetry (L5FS) act as hard "particles" which are embedded in the relatively soft matrix. We demonstrate this concept by performing atomistic simulations of shear banding in CuZr MG. A shear band is prone to form in a sample with a high degree of L5FS which is slowly quenched from the liquid. An atomic-scale analysis on strain and the structural evolution reveals that it is the strain gradient effect that has originated from structural heterogeneity that facilitates shear transformation zones (STZs) to mature shear bands. An artificial composite model with a high degree of strain gradient, generated by inserting hard MG strips into a soft MG matrix, demonstrates a great propensity for shear banding. It therefore confirms the critical role strain gradient plays in shear banding. The strain gradient effect on shear banding is further quantified with a continuum model and a mechanical instability analysis. These physical insights might highlight the strain gradient as the hidden driving force in transforming STZs into shear bands in MGs.
DOI	10.1103/PhysRevB.96.094103
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000409428500001
关键词[WOS]	MEDIUM-RANGE ORDER ; MOLECULAR-DYNAMICS ; MATRIX COMPOSITES ; FORMING LIQUIDS ; 5-FOLD SYMMETRY ; PLASTIC-FLOW ; DEFORMATION ; INSTABILITY ; TRANSITION ; MECHANISM
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
项目资助者	NSFC(11472287 ; National Key Research and Development Program of China(2017YFB0702003) ; Key Research Program of Frontier Sciences(QYZDJSSW-JSC011) ; Chinese Academy of Sciences(XDB22040302) ; 11402269 ; 11672299 ; 11572324)
课题组名称	LNM冲击动力学与新型材料力学性能
论文分区	一类
力学所作者排名	1
引用统计	被引频次：30[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/311007/70051
专题	非线性力学国家重点实验室
通讯作者	Dai, LH (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	Tian, Zhi-Li,Wang YJ,Chen Y,et al. Strain gradient drives shear banding in metallic glasses[J]. PHYSICAL REVIEW B,2017,96,9,.
APA	Tian, Zhi-Li,王云江,陈艳,戴兰宏,&Dai, LH .(2017).Strain gradient drives shear banding in metallic glasses.PHYSICAL REVIEW B,96(9).
MLA	Tian, Zhi-Li,et al."Strain gradient drives shear banding in metallic glasses".PHYSICAL REVIEW B 96.9(2017).

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