| 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
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| Corresponding Author | Zhang, Kun(zhangkun@imech.ac.cn) ; Wei, Bingchen(weibc@imech.ac.cn) |
| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
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| 2022-11-01 | |
| Volume | 158Pages:16 |
| ISSN | 0749-6419 |
| Abstract | 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. |
| Keyword | High -entropy alloys Tension -compression asymmetry Work hardening Heterogeneous deformation Additive manufacturing |
| DOI | 10.1016/j.ijplas.2022.103432 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000874924700003 |
| WOS Keyword | MAGNESIUM ALLOY ; HIGH-DUCTILITY ; HIGH-STRENGTH ; SHEAR BANDS ; DEFORMATION ; MECHANISM ; EVOLUTION ; TEXTURE |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Project | 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 |
| Funding Organization | 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 |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Zhang, Kun ; Wei, Bingchen |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/90511 |
| Collection | 微重力重点实验室 非线性力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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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