Spatio-temporal dynamics of jerky flow in high-entropy alloy at extremely low temperature

doi:10.1080/14786435.2020.1822557

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 R 4; Chen Y(陈艳)1,2,3 ; Lu C5 ; Ananthakrishna G 6; Dai LH(戴兰宏)1,2,3
通讯作者	Dai, L. H.([email protected])
发表期刊	PHILOSOPHICAL MAGAZINE
	2020-09-24
页码	25
ISSN	1478-6435
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.
关键词	High-entropy alloy cryogenic temperature jerky flow linear perturbation analysis chaotic
DOI	10.1080/14786435.2020.1822557
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000573154800001
关键词[WOS]	PLASTIC-FLOW ; MECHANICAL-PROPERTIES ; LYAPUNOV EXPONENTS ; DEFORMATION ; INSTABILITY ; METALS ; SERRATION ; OSCILLATIONS ; BEHAVIOR ; MODEL
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
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]
项目资助者	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
论文分区	二类
力学所作者排名	1
RpAuthor	Dai, L. H.
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/85289
专题	非线性力学国家重点实验室
作者单位	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
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.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.

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