中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Unusual phase transformation and novel hardening mechanisms upon impact loading in a medium entropy alloy with dual heterogeneous structure

文献类型:期刊论文

作者Zhang ZH(张子晗); Ma Y(马彦); Tan S(覃双); Wang J(王建); Yang MX(杨沐鑫); Jiang P(姜萍); Wu XL(武晓雷); Yuan FP(袁福平)
刊名INTERMETALLICS
出版日期2022-12-01
卷号151页码:11
ISSN号0966-9795
关键词High-entropy alloys Phase transformation Mechanical properties Shear band Age-hardening Microstructure
DOI10.1016/j.intermet.2022.107747
通讯作者Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要Dynamic shear properties and corresponding deformation mechanisms of a CrCoNi-based medium entropy alloy (MEA) with both coherent nanoprecipitate and heterogeneous grain structure were investigated utilizing hat -shaped specimens in Hopkinson-bar and microstructure characterization. The present MEA with dual hetero-geneous structure is found to have extraordinary dynamic shear properties, as compared to the other advanced metals and alloys, including the CrCoNi MEA with similar heterogeneous grain structure while with single FCC phase. A formula for considering effects of strain hardening, strain rate and thermal softening was utilized to calculate the critical shear strain for onset of adiabatic shear band for the present MEA, and the experimental results were found to be well predicted by the theoretical estimations. The formations of microscopic shear bands with low-angle grain boundary type, nano-grains, deformation twins, stacking fault network, and Lomer-Cottrell locks were found to be responsible for the multiple strain hardening mechanisms during dynamic shear defor-mation for both unaged and aged samples. An unusual phase transformation (gamma ->sigma) was observed for only aged samples under dynamic shear loading, which was not found under quasi-static conditions before, should have significant contribution on strain hardening due to the precipitation by-passing hardening by the hard sigma nano -particles.
分类号二类/Q1
WOS关键词SHORT-RANGE ORDER ; LATTICE DISTORTION ; SHEAR BANDS ; DEFORMATION ; GRADIENT ; MICROSTRUCTURE ; PLASTICITY ; BEHAVIOR ; STRESS ; NANOPARTICLES
资助项目NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; National Key R&D Program of China[2017YFA0204402] ; National Natural Science Foundation of China[52192591] ; National Natural Science Foundation of China[11790293]
WOS研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000888054100001
资助机构NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; National Key R&D Program of China ; National Natural Science Foundation of China
其他责任者Yuan, Fuping
源URL[http://dspace.imech.ac.cn/handle/311007/91032]  
专题力学研究所_非线性力学国家重点实验室
推荐引用方式
GB/T 7714
Zhang ZH,Ma Y,Tan S,et al. Unusual phase transformation and novel hardening mechanisms upon impact loading in a medium entropy alloy with dual heterogeneous structure[J]. INTERMETALLICS,2022,151:11.
APA 张子晗.,马彦.,覃双.,王建.,杨沐鑫.,...&袁福平.(2022).Unusual phase transformation and novel hardening mechanisms upon impact loading in a medium entropy alloy with dual heterogeneous structure.INTERMETALLICS,151,11.
MLA 张子晗,et al."Unusual phase transformation and novel hardening mechanisms upon impact loading in a medium entropy alloy with dual heterogeneous structure".INTERMETALLICS 151(2022):11.

入库方式: OAI收割

来源:力学研究所

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