IMECH-IR  > 非线性力学国家重点实验室
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 AuthorDai, L. H.(lhdai@lnm.imech.ac.cn)
Source PublicationPHILOSOPHICAL MAGAZINE
2020-09-24
Pages25
ISSN1478-6435
AbstractDespite 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.
KeywordHigh-entropy alloy cryogenic temperature jerky flow linear perturbation analysis chaotic
DOI10.1080/14786435.2020.1822557
Indexed BySCI ; EI
Language英语
WOS IDWOS:000573154800001
WOS KeywordPLASTIC-FLOW ; MECHANICAL-PROPERTIES ; LYAPUNOV EXPONENTS ; DEFORMATION ; INSTABILITY ; METALS ; SERRATION ; OSCILLATIONS ; BEHAVIOR ; MODEL
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
Funding ProjectKey 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 OrganizationKey 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
Ranking1
ContributorDai, L. H.
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/85289
Collection非线性力学国家重点实验室
Affiliation1.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.
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.
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