| Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature | |
Pu Z(蒲卓)1,2,3; Xie ZC(谢周璨)1,2,3; Sarmah R4; Chen Y(陈艳)1,2,3 ; Lu C5; Ananthakrishna G6; Dai LH(戴兰宏)1,2,3
| |
| Corresponding Author | Dai, L. H.([email protected]) |
| Source Publication | PHILOSOPHICAL MAGAZINE
 |
| 2020-09-24 | |
| Pages | 25 |
| ISSN | 1478-6435 |
| Abstract | 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. |
| Keyword | High-entropy alloy cryogenic temperature jerky flow linear perturbation analysis chaotic |
| DOI | 10.1080/14786435.2020.1822557 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000573154800001 |
| WOS Keyword | PLASTIC-FLOW ; MECHANICAL-PROPERTIES ; LYAPUNOV EXPONENTS ; DEFORMATION ; INSTABILITY ; METALS ; SERRATION ; OSCILLATIONS ; BEHAVIOR ; MODEL |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering ; Physics |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter |
| Funding Project | 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] |
| Funding Organization | 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 |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Dai, L. H. |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/85289 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Univ Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100190, Peoples R China; 3.CAS Ctr Excellence Complex Syst Mech, Beijing 100190, Peoples R China; 4.Tezpur Univ, Dept Phys, Tezpur, Assam, India; 5.Curtin Univ, Sch Civil & Mech Engn, Perth, WA, Australia; 6.Indian Inst Sci, Mat Res Ctr, Bangalore, Karnataka, India |
| Recommended Citation 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.Rp_Au:Dai, L. H. |
| 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Jp2020332.pdf（3141KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment