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Strain rate dependent shear localization and deformation mechanisms in the CrMnFeCoNi high-entropy alloy with various microstructures

文献类型：期刊论文

作者Yang ZL(杨正凌)1,2; Yang MX(杨沐鑫)2; Ma Y(马彦)1,2; Zhou LL(周玲玲)2; Cheng WQ(程文强)1,2; Yuan FP(袁福平)1,2; Wu XL(武晓雷)1,2
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2020-08-19
卷号793页码:10
ISSN号0921-5093
关键词High entropy alloys Deformation twins Shear localization Strain rate effect Strain hardening
DOI10.1016/j.msea.2020.139854
通讯作者Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要CrMnFeCoNi high-entropy alloys (HEA) with various microstructures have been produced using cold rolling followed by critical annealing at various temperatures. Shear deformation behaviors of this HEA with various microstructures at a wide range of strain rates (2 x 10(-3)-5 x 10(4) s(-1)) have been characterized using hat-shaped specimens. Strain hardening exponent and strain rate sensitivity have been obtained for various microstructures. No shear localization was observed up to shear strain of 8 for all microstructures under lower strain rates (2 x 10(-3)-1 x 10(1) s(-1)), while stress drop and shear localization were found to occur at various critical shear strains for various microstructures under dynamic shear loading (5 x 10(4) s(-1)). A new formula, considering competition of strain hardening and strain rate hardening against thermal softening, was proposed to estimate the critical shear strains under dynamic shear loading and the predicted results were found to be in a fairly good agreement with the experimental data. Based on micro-hardness testing, the strain hardening due to the microstructure evolution was found be much stronger under dynamic shear loading than that under quasi-static loading at the same interrupted shear strain, which can be attributed to the more efficient grain refinement and the triggered hierarchical deformation nanotwins under dynamic shear deformation.
分类号一类
WOS关键词RATE SENSITIVITY ; IMPACT TOUGHNESS ; HIGH-STRENGTH ; BEHAVIOR ; GRAIN ; CRCONI ; STABILITY ; EVOLUTION ; NANOTWINS ; DUCTILITY
资助项目National Key R&D Program of China[2017YFA0204402] ; National Natural Science Foundation of China[11672313] ; National Natural Science Foundation of China[11790293] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000578957200026
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者Yuan, Fuping
源URL[http://dspace.imech.ac.cn/handle/311007/85384]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Yang ZL,Yang MX,Ma Y,et al. Strain rate dependent shear localization and deformation mechanisms in the CrMnFeCoNi high-entropy alloy with various microstructures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,793:10.
APA 杨正凌.,杨沐鑫.,马彦.,周玲玲.,程文强.,...&武晓雷.(2020).Strain rate dependent shear localization and deformation mechanisms in the CrMnFeCoNi high-entropy alloy with various microstructures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,793,10.
MLA 杨正凌,et al."Strain rate dependent shear localization and deformation mechanisms in the CrMnFeCoNi high-entropy alloy with various microstructures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 793(2020):10.

入库方式： OAI收割

来源：力学研究所

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