Transition from stress-driven to thermally activated stress relaxation in metallic glasses

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	Transition from stress-driven to thermally activated stress relaxation in metallic glasses
	Qiao JC; Wang YJ; Zhao LZ; Dai LH(戴兰宏); Crespo D; Pelletier JM; Keer LM; Yao Y
刊名	PHYSICAL REVIEW B
	2016
通讯作者邮箱	yjwang@imech.ac.cn ; yaoy@nwpu.edu.cn
卷号	94 期号:10 页码:104203
ISSN号	2469-9950
通讯作者	Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. ; Wang, YJ (reprint author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China.
产权排序	[Qiao, J. C.; Yao, Y.] Northwestern Polytech Univ, Sch Mech Civil Engn & Architecture, Xian 710072, Peoples R China; [Wang, Yun-Jiang; Dai, L. H.] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Wang, Yun-Jiang; Dai, L. H.] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China; [Zhao, L. Z.] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China; [Crespo, D.] Univ Politecn Cataluna, EETAC, Dept Fis, Barcelona 08860, Spain; [Pelletier, J. M.] Univ Lyon, INSA Lyon, MATEIS, UMR CNRS5510, Bat B Pascal, F-69621 Villeurbanne, France; [Keer, L. M.] Northwestern Univ, Dept Mech Engn, 2145 Sheridan Rd, Evanston, IL 60208 USA
中文摘要	The short-range ordered but long-range disordered structure of metallic glasses yields strong structural and dynamic heterogeneities. Stress relaxation is a technique to trace the evolution of stress in response to a fixed strain, which reflects the dynamic features phenomenologically described by the Kohlrausch-Williams-Watts (KWW) equation. The KWW equation describes a broad distribution of relaxation times with a small number of empirical parameters, but it does not arise from a particular physically motivated mechanistic picture. Here we report an anomalous two-stage stress relaxation behavior in a Cu46Zr46Al8 metallic glass over a wide temperature range and generalize the findings in other compositions. Thermodynamic analysis identifies two categories of processes: a fast stress-driven event with large activation volume and a slow thermally activated event with small activation volume, which synthetically dominates the stress relaxation dynamics. Discrete analyses rationalize the transition mechanism induced by stress and explain the anomalous variation of the KWW characteristic time with temperature. Atomistic simulations reveal that the stress-driven event involves virtually instantaneous short-range atomic rearrangement, while the thermally activated event is the percolation of the fast event accommodated by the long-range atomic diffusion. The insights may clarify the underlying physical mechanisms behind the phenomenological description and shed light on correlating the hierarchical dynamics and structural heterogeneity of amorphous solids.
分类号	一类
类目[WOS]	Physics, Condensed Matter
研究领域[WOS]	Physics
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1103/PhysRevB.94.104203
语种	英语
WOS记录号	WOS:000383859300002
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/59722]
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	Qiao JC,Wang YJ,Zhao LZ,et al. Transition from stress-driven to thermally activated stress relaxation in metallic glasses[J]. PHYSICAL REVIEW B,2016,94(10):104203.
APA	Qiao JC.,Wang YJ.,Zhao LZ.,戴兰宏.,Crespo D.,...&Yao Y.(2016).Transition from stress-driven to thermally activated stress relaxation in metallic glasses.PHYSICAL REVIEW B,94(10),104203.
MLA	Qiao JC,et al."Transition from stress-driven to thermally activated stress relaxation in metallic glasses".PHYSICAL REVIEW B 94.10(2016):104203.