Unusual phase transformation and novel hardening mechanisms upon impact loading in a medium entropy alloy with dual heterogeneous structure

doi:10.1016/j.intermet.2022.107747

IMECH-IR > 非线性力学国家重点实验室

	Unusual phase transformation and novel hardening mechanisms upon impact loading in a medium entropy alloy with dual heterogeneous structure
	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)
通讯作者	Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
发表期刊	INTERMETALLICS
	2022-12-01
卷号	151 页码:11
ISSN	0966-9795
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.
关键词	High-entropy alloys Phase transformation Mechanical properties Shear band Age-hardening Microstructure
DOI	10.1016/j.intermet.2022.107747
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000888054100001
关键词[WOS]	SHORT-RANGE ORDER ; LATTICE DISTORTION ; SHEAR BANDS ; DEFORMATION ; GRADIENT ; MICROSTRUCTURE ; PLASTICITY ; BEHAVIOR ; STRESS ; NANOPARTICLES
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
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]
项目资助者	NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; National Key R&D Program of China ; National Natural Science Foundation of China
论文分区	二类/Q1
力学所作者排名	1
RpAuthor	Yuan, Fuping
引用统计	被引频次：4[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/311007/91033
专题	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.

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