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

文献类型：期刊论文

作者Ming, Kaisheng3; Li, Bo3; Bai, Lichen3; Jiang, Ping2; Wu, Xiaolei2; Zheng, Shijian3; Wang, Jian1; Jiang P(姜萍); Wu XL(武晓雷)
刊名ACTA MATERIALIA
出版日期2022-06-15
卷号232页码:12
ISSN号1359-6454
关键词High-entropy alloy Deformation twinning Martensitic phase transformations Mechanical properties High-resolution electron microscope
DOI10.1016/j.actamat.2022.117937
通讯作者Zheng, Shijian(sjzheng@hebut.edu.cn) ; Wang, Jian(jianwang@unl.edu)
英文摘要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.
WOS关键词INDUCED PLASTICITY STEEL ; PHASE-TRANSFORMATION ; DEFORMATION ; MECHANISMS ; BEHAVIOR ; METALS
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]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000796619700002
资助机构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
源URL[http://dspace.imech.ac.cn/handle/311007/89537]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Zheng, Shijian; Wang, Jian
作者单位1.Univ Nebraska, Mech & Mat Engn, Lincoln, NE 68588 USA
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
3.Hebei Univ Technol, Sch Mat Sci & Engn, State Key Lab Reliabil & Intelligence Elect Equip, Tianjin 300401, Peoples R China
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.,Jiang, Ping.,Wu, Xiaolei.,...&武晓雷.(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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来源：力学研究所

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