中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Unraveling strongly entropic effect on beta-relaxation in metallic glass: Insights from enhanced atomistic samplings over experimentally relevant timescales

文献类型:期刊论文

作者Yang YB(杨一博); Yang Q; Wei D(魏丹); Dai LH(戴兰宏); Yu HB; Wang YJ(王云江)
刊名PHYSICAL REVIEW B
出版日期2020-11-04
卷号102期号:17页码:174103
ISSN号2469-9950
关键词ENERGY LANDSCAPE SECONDARY RELAXATIONS MECHANICAL-BEHAVIOR SUPERCOOLED LIQUIDS DEFORMATION DYNAMICS PLASTICITY SIGNATURES DIFFUSION
DOI10.1103/PhysRevB.102.174103
英文摘要The Johari-Goldstein secondary (beta) relaxation is an intrinsic feature of glasses, which is crucial to many properties of disordered materials. One puzzling feature of beta-relaxation is its wide relaxation peak, which could imply a critical role of entropy. Here we quantify the activation entropy related to the beta-relaxation in metallic glass via well-tempered metadynamics simulations. The activation free energy of the beta-relaxation drastically decreases with increasing temperature, indicating a strongly entropic effect that may contribute a multiplication prefactor up to several orders of magnitude to the frequency. We further argue the entropic effect by linear extrapolation of the temperature-dependent activation free energy to 0 K, which gives rise to activation energy, in agreement with the barrier spectrum explored by the activation-relaxation technique. The entropic effect signifies the multiplicity of activation pathways which agrees with the experimentally found wide frequency domain of the beta-relaxation.
分类号二类
WOS研究方向Materials Science ; Physics
语种英语
WOS记录号WOS:000584956000001
资助机构NSFCNational Natural Science Foundation of China (NSFC) [12072344, 11672299, 11790292} ; National Key Research and Development Program of China [2017YFB0702003, 2017YFB0701502} ; Youth Innovation Promotion Association of the Chinese Academy of Sciences [2017025}
其他责任者Wang, YJ
源URL[http://dspace.imech.ac.cn/handle/311007/85428]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.{Yang Yi-Bo} Univ Chicago Dept Stat Chicago IL 60637 USA
2.{Dai Lan-Hong, Wang Yun-Jiang} Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China
3.{Yang Qun, Yu Hai-Bin} Huazhong Univ Sci & Technol Sch Phys Wuhan 430074 Hubei Peoples R China
4.{Yang Qun, Yu Hai-Bin} Huazhong Univ Sci & Technol Wuhan Natl High Magnet Field Ctr Wuhan 430074 Hubei Peoples R China
5.{Yang Yi-Bo} Univ Chinese Acad Sci Sch Phys Sci Beijing 100049 Peoples R China
6.{Yang Yi-Bo, Wei Dan, Dai Lan-Hong, Wang Yun-Jiang} Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China
推荐引用方式
GB/T 7714
Yang YB,Yang Q,Wei D,et al. Unraveling strongly entropic effect on beta-relaxation in metallic glass: Insights from enhanced atomistic samplings over experimentally relevant timescales[J]. PHYSICAL REVIEW B,2020,102(17):174103.
APA 杨一博,Yang Q,魏丹,戴兰宏,Yu HB,&王云江.(2020).Unraveling strongly entropic effect on beta-relaxation in metallic glass: Insights from enhanced atomistic samplings over experimentally relevant timescales.PHYSICAL REVIEW B,102(17),174103.
MLA 杨一博,et al."Unraveling strongly entropic effect on beta-relaxation in metallic glass: Insights from enhanced atomistic samplings over experimentally relevant timescales".PHYSICAL REVIEW B 102.17(2020):174103.

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来源:力学研究所

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