Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature
文献类型：期刊论文
| 作者 | Pu Z(蒲卓)4,5,6; Xie ZC(谢周璨)4,5,6; Sarmah R3; Chen Y(陈艳)4,5,6 ; Lu C2; Ananthakrishna G1; Dai LH(戴兰宏)4,5,6
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| 刊名 | PHILOSOPHICAL MAGAZINE
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| 出版日期 | 2020-09-24 |
| 页码 | 25 |
| ISSN号 | 1478-6435 |
| 关键词 | High-entropy alloy cryogenic temperature jerky flow linear perturbation analysis chaotic |
| DOI | 10.1080/14786435.2020.1822557 |
| 通讯作者 | Dai, L. H.(lhdai@lnm.imech.ac.cn) |
| 英文摘要 | Despite a large body of literature, mechanisms contributing to low temperature jerky flow remain controversial. Here, we report a cross-over from a smooth at room and liquid nitrogen temperatures to serrated plastic flow at 4.2 K in high-entropy CrMnFeCoNi alloy. Several complimentary investigations have been carried out to get a coherent physical picture of low temperature jerky flow in these alloys. Microstructural characterisations at 77 K and 4.2 K show that the number of Lomer-Cottrell (L-C) locks at 4.2 K is much higher than that at 77 K, inducing stronger barriers for dislocation glide at 4.2 K. A stability analysis shows that the jerky flow results from an interaction between dislocation inertial motion with L-C locks. The instability results from a competition between inertial and viscous time scales characterised by a Deborah number. A detailed nonlinear time series analysis of experimental serrated stress signals shows that jerky flow is chaotic characterised by the existence of a finite correlation dimension and a positive Lyapunov exponent. Further, the minimum degree of freedom required for the chaotic dynamics turns out to be four, consistent with four collective modes degrees of freedom used in our model equations. These results highlight the crucial ingredients for jerky flow at liquid helium temperatures. |
| 分类号 | 二类 |
| WOS关键词 | PLASTIC-FLOW ; MECHANICAL-PROPERTIES ; LYAPUNOV EXPONENTS ; DEFORMATION ; INSTABILITY ; METALS ; SERRATION ; OSCILLATIONS ; BEHAVIOR ; MODEL |
| 资助项目 | Key Research Program of Frontier Sciences of the Chinese Academy of Sciences[QYZDJSSW-JSC011] ; Science Challenge Project[TZ2016001] ; National Key Research and Development Program of China[2017YFB0702003] ; NSFC[11572324] ; NSFC[11790292] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040302] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040303] ; opening project of State Key Laboratory of Explosion Science and Technology[KFJJ18-14M] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000573154800001 |
| 资助机构 | Key Research Program of Frontier Sciences of the Chinese Academy of Sciences ; Science Challenge Project ; National Key Research and Development Program of China ; NSFC ; Strategic Priority Research Program of the Chinese Academy of Sciences ; opening project of State Key Laboratory of Explosion Science and Technology |
| 其他责任者 | Dai, L. H. |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/85288]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Indian Inst Sci, Mat Res Ctr, Bangalore, Karnataka, India 2.Curtin Univ, Sch Civil & Mech Engn, Perth, WA, Australia; 3.Tezpur Univ, Dept Phys, Tezpur, Assam, India; 4.CAS Ctr Excellence Complex Syst Mech, Beijing 100190, Peoples R China; 5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China; 6.Univ Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Pu Z,Xie ZC,Sarmah R,et al. Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature[J]. PHILOSOPHICAL MAGAZINE,2020:25. |
| APA | 蒲卓.,谢周璨.,Sarmah R.,陈艳.,Lu C.,...&戴兰宏.(2020).Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature.PHILOSOPHICAL MAGAZINE,25. |
| MLA | 蒲卓,et al."Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature".PHILOSOPHICAL MAGAZINE (2020):25. |
入库方式： OAI收割
来源：力学研究所
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