Unraveling strongly entropic effect on beta-relaxation in metallic glass: Insights from enhanced atomistic samplings over experimentally relevant timescales | |
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 |
2020-11-04 | |
卷号 | 102期号:17页码:174103 |
关键词 | ENERGY LANDSCAPE SECONDARY RELAXATIONS MECHANICAL-BEHAVIOR SUPERCOOLED LIQUIDS DEFORMATION DYNAMICS PLASTICITY SIGNATURES DIFFUSION |
ISSN号 | 2469-9950 |
DOI | 10.1103/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 |
内容类型 | 期刊论文 |
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, Wei Dan, Dai Lan-Hong, Wang Yun-Jiang} Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China 2.{Yang Yi-Bo} Univ Chicago Dept Stat Chicago IL 60637 USA 3.{Dai Lan-Hong, Wang Yun-Jiang} Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China 4.{Yang Qun, Yu Hai-Bin} Huazhong Univ Sci & Technol Sch Phys Wuhan 430074 Hubei Peoples R China 5.{Yang Qun, Yu Hai-Bin} Huazhong Univ Sci & Technol Wuhan Natl High Magnet Field Ctr Wuhan 430074 Hubei Peoples R China 6.{Yang Yi-Bo} Univ Chinese Acad Sci Sch Phys Sci Beijing 100049 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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