Dynamically reversible shear transformations in a CrMnFeCoNi high-entropy alloy at cryogenic temperature

doi:10.1016/j.actamat.2022.117937

IMECH-IR > 非线性力学国家重点实验室

	Dynamically reversible shear transformations in a CrMnFeCoNi high-entropy alloy at cryogenic temperature
	Ming, Kaisheng 1; Li, Bo1 ; Bai, Lichen 1; Jiang P(姜萍)2 ; Wu XL(武晓雷)2 ; Zheng, Shijian 1; Wang, Jian3
通讯作者	Zheng, Shijian(sjzheng@hebut.edu.cn) ; Wang, Jian(jianwang@unl.edu)
发表期刊	ACTA MATERIALIA
	2022-06-15
卷号	232 页码:12
ISSN	1359-6454
摘要	Shear transformation, such as twinning and martensitic phase transformation, is generally unidirectional under monotonic thermal or mechanical loading. Here, we report the dynamically reversible shear transformations in a CrMnFeCoNi high-entropy alloy (HEA) under uniaxial tension at the extremely low temperature of 4.2 K. Since stacking fault energy (SFE) of CrMnFeCoNi HEA with a face-centered cubic (fcc) structure is low and decreases with decreasing temperature, plastic deformation is accommodated by dislocation slips and shear transformation bands, such as {111} stacking faults (SFs), {111} nano-twins and fcc -> hcp (hexagonal close-packed structure) shear transformation bands. When deformed at 4.2 K, the lower SFE promotes fcc -> hcp shear transformation, forming hcp grains. Besides basal and non-basal dislocation slips in hcp grains, high-density {0 0 01} SFs and {1 0 1 over line 1} nano-twinning are activated to accommodate plastic deformation. More intriguingly, reverse hcp -> fcc shear transformations are stimulated by deformation-induced local dissipative heating. The reversible fcc <-> hcp shear transformations and both {1 0 1 over line 1} and {111} nano-twinning lead to dynamic nano-laminated dual-phase (NL-DP) structures, which advances the monotonic "dynamic Hall-Petch" effect in enhancing strength, strain-hardening ability, and ductility by dynamically tailoring the type and width of shear transformation bands. Our work provides a promising strategy for evading the strength-ductility dilemma via dynamically developing NL-DP structures through activating reversible shear transformations.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	High-entropy alloy Deformation twinning Martensitic phase transformations Mechanical properties High-resolution electron microscope
DOI	10.1016/j.actamat.2022.117937
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000796619700002
关键词[WOS]	INDUCED PLASTICITY STEEL ; PHASE-TRANSFORMATION ; DEFORMATION ; MECHANISMS ; BEHAVIOR ; METALS
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助项目	National Natural Science Foundation of China[52002109] ; National Natural Science Foundation of China[51771201] ; National Natural Science Foundation of China[52071124] ; Natural Science Foundation of the Hebei province[E2020202088] ; Natural Science Foundation of the Hebei province[E2021202135] ; Natural Science Foundation of Tianjin[20JCZDJC00440] ; Overseas Scientists Sponsorship Program by Hebei Province[C20210331] ; Open Research Fund from the State Key Laboratory of Rolling and Automation, Northeastern University[2020RALKFKT002]
项目资助者	National Natural Science Foundation of China ; Natural Science Foundation of the Hebei province ; Natural Science Foundation of Tianjin ; Overseas Scientists Sponsorship Program by Hebei Province ; Open Research Fund from the State Key Laboratory of Rolling and Automation, Northeastern University
论文分区	一类
力学所作者排名	3+
RpAuthor	Zheng, Shijian ; Wang, Jian
引用统计	被引频次：20[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/311007/89538
专题	非线性力学国家重点实验室
作者单位	1.Hebei Univ Technol, Sch Mat Sci & Engn, State Key Lab Reliabil & Intelligence Elect Equip, Tianjin 300401, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 3.Univ Nebraska, Mech & Mat Engn, Lincoln, NE 68588 USA
推荐引用方式 GB/T 7714	Ming, Kaisheng,Li, Bo,Bai, Lichen,et al. Dynamically reversible shear transformations in a CrMnFeCoNi high-entropy alloy at cryogenic temperature[J]. ACTA MATERIALIA,2022,232:12.
APA	Ming, Kaisheng.,Li, Bo.,Bai, Lichen.,姜萍.,武晓雷.,...&Wang, Jian.(2022).Dynamically reversible shear transformations in a CrMnFeCoNi high-entropy alloy at cryogenic temperature.ACTA MATERIALIA,232,12.
MLA	Ming, Kaisheng,et al."Dynamically reversible shear transformations in a CrMnFeCoNi high-entropy alloy at cryogenic temperature".ACTA MATERIALIA 232(2022):12.

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