Alterable tension-compression asymmetry in work hardening of an additively manufactured dual-phase high-entropy alloy

doi:10.1016/j.ijplas.2022.103432

IMECH-IR > 微重力重点实验室

	Alterable tension-compression asymmetry in work hardening of an additively manufactured dual-phase high-entropy alloy
	Bai YJ(白云建)1,3 ; Zhang K(张坤)1,3 ; Chen TY(陈天宇)1,3; Liu ZS(刘子尚)1,3 ; Wang YJ(王云江)2,3 ; Wei BC(魏炳忱)1,3
通讯作者	Zhang, Kun(zhangkun@imech.ac.cn) ; Wei, Bingchen(weibc@imech.ac.cn)
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
	2022-11-01
卷号	158 页码:16
ISSN	0749-6419
摘要	High-entropy alloys (HEAs) as potential structural materials appear to exhibit tension -compression asymmetry (TCA) in work hardening. However, the intricate origin of the TCA, particularly in multi-domain HEAs, remains unclear. Herein, an additive manufactured AlCoCr-FeNi2.1 dual-phase (FCC + BCC) HEA was used as a prototypical model system to gain a fundamental understanding of the TCA in multi-domain HEAs. Microscopic characterizations demonstrate that the TCA in work hardening is primarily attributed to the dominant stacking fault (SF)-dislocation interaction, SF-SF interaction, and subordinate twin-dislocation interaction, all of which are observed only in the FCC phase in compression. The former two mechanisms not only offer strong strengthening by impeding dislocation motion, but also bring considerable plasticity. The latter mechanism occurs in the dense SF regions to accommodate the plastic deformation, and contribute to additional work hardening. However, in tension, there are only dislocations generated inside the FCC phase. The marked difference in the deformation of the FCC phase is closely related to the FCC/BCC alternating lamellar heterostructure. Dislocations will preferentially nucleate and accumulate at the phase boundary, resulting in localized stress con-centration. In tension, the stress concentration will lead to rapid crack propagation parallel to the phase boundary, resulting in premature failure of the sample. In compression, various types of cracks are formed and develop slowly, postponing the failure of the sample. Also, this TCA has the potential to be tuned by tailoring the FCC/BCC lamellar heterostructure; specifically, the width ratio of the FCC phase to the BCC phase. Our findings deliver cutting-edge insights relative to the TCA in new forms of alloys and offer a promising strategy to achieve the tunable possibility of the TCA in the work hardening by designing hierarchical heterostructures.
关键词	High -entropy alloys Tension -compression asymmetry Work hardening Heterogeneous deformation Additive manufacturing
DOI	10.1016/j.ijplas.2022.103432
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000874924700003
关键词[WOS]	MAGNESIUM ALLOY ; HIGH-DUCTILITY ; HIGH-STRENGTH ; SHEAR BANDS ; DEFORMATION ; MECHANISM ; EVOLUTION ; TEXTURE
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
资助项目	National Natural Science Foundation of China[12272392] ; National Natural Science Foundation of China[11790292] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040303] ; Innovation Program[237099000000170004] ; NSFC[12072344] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program ; NSFC ; Youth Innovation Promotion Association of the Chinese Academy of Sciences
论文分区	一类
力学所作者排名	1
RpAuthor	Zhang, Kun ; Wei, Bingchen
引用统计	被引频次：6[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/311007/90511
专题	微重力重点实验室非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Key Lab Micrograv, Beijing 100190, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Bai YJ,Zhang K,Chen TY,et al. Alterable tension-compression asymmetry in work hardening of an additively manufactured dual-phase high-entropy alloy[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2022,158:16.
APA	白云建,张坤,陈天宇,刘子尚,王云江,&魏炳忱.(2022).Alterable tension-compression asymmetry in work hardening of an additively manufactured dual-phase high-entropy alloy.INTERNATIONAL JOURNAL OF PLASTICITY,158,16.
MLA	白云建,et al."Alterable tension-compression asymmetry in work hardening of an additively manufactured dual-phase high-entropy alloy".INTERNATIONAL JOURNAL OF PLASTICITY 158(2022):16.

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