| 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)
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| Source Publication | PHYSICAL REVIEW B
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| 2020-11-04 | |
| Volume | 102Issue:17Pages:174103 |
| ISSN | 2469-9950 |
| Abstract | 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. |
| Keyword | ENERGY LANDSCAPE SECONDARY RELAXATIONS MECHANICAL-BEHAVIOR SUPERCOOLED LIQUIDS DEFORMATION DYNAMICS PLASTICITY SIGNATURES DIFFUSION |
| DOI | 10.1103/PhysRevB.102.174103 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000584956000001 |
| WOS Research Area | Materials Science ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter |
| Funding Organization | 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} |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Wang, YJ |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/85428 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 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 Chinese Acad Sci Sch Phys Sci Beijing 100049 Peoples R China 3.{Yang Qun, Yu Hai-Bin} Huazhong Univ Sci & Technol Wuhan Natl High Magnet Field Ctr Wuhan 430074 Hubei Peoples R China 4.{Yang Qun, Yu Hai-Bin} Huazhong Univ Sci & Technol Sch Phys Wuhan 430074 Hubei Peoples R China 5.{Dai Lan-Hong, Wang Yun-Jiang} Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China 6.{Yang Yi-Bo} Univ Chicago Dept Stat Chicago IL 60637 USA |
| Recommended Citation 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.Rp_Au:Wang, YJ |
| 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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| Jp2020387.pdf（1402KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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