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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; 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.
Source PublicationPHYSICAL REVIEW B
2016
Volume94Issue:10Pages:104203
ISSN2469-9950
AbstractThe 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.
DOI10.1103/PhysRevB.94.104203
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000383859300002
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
Funding OrganizationThis work is partially supported by the NSFC (Grants No. 11132011, No. 11402269, No. 11672299, No. 11472287, No. 51401192, No. 11572249, and No. 51611130120), the National Key Basic Research Program of China (Grant No. 2012CB937500), the Natural Science Foundation of Shaanxi Province (No. 2016JM5009), the Fundamental Research Funds for the Central Universities (No. 3102015ZY027, 3102015BJ(II)JGZ019), the Aeronautical Science Foundation of China (2015ZF53072), Opening fund of State Key Laboratory of Nonlinear Mechanics (LNM201511), and the CAS/SAFEA International Partnership Program for Creative Research Teams. D.C. acknowledges the support from Spanish MINECO (Grant No. FIS2014-54734-P) and Generalitat de Catalunya (Grant No. 2014SGR00581). The calculations were performed at the National Supercomputing Center in Shenzhen.
DepartmentLNM冲击动力学与新型材料力学性能
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59722
Collection非线性力学国家重点实验室
Corresponding AuthorWang, 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.
Recommended Citation
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.,...&Wang, YJ .(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.
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