| Enhanced tensile properties by heterogeneous grain structures and coherent precipitates in a CoCrNi-based medium entropy alloy | |
Zhang ZH(张子晗) ; Jiang P(姜萍); Yuan FP(袁福平); Wu XL(武晓雷)
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| Corresponding Author | Yuan, Fuping([email protected]) |
| Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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| 2022-01-14 | |
| Volume | 832Pages:11 |
| ISSN | 0921-5093 |
| Abstract | A dual heterogeneous structure with both heterogeneous grain structure and coherent L1(2) nanoprecipitates was obtained in a CoCrNi-based medium entropy alloy (MEA) with chemical composition of Co34.5Cr32-Ni27.5Al3Ti3 (in at%). The volume fraction of L1(2) phase is observed to become higher and the corresponding interspacing becomes smaller after aging, resulting in a more severe heterogeneity. The unaged samples are found to have better tensile properties as compared to those for the CoCrNi MEA with homogeneous and het-erogeneous grain structures. The aged samples display an even better synergy of strength and ductility than the corresponding unaged samples. The hetero-deformation-induced hardening plays a more important role in the aged samples than in the unaged samples, especially at the elasto-plastic transition stage, producing higher density of geometrically necessary dislocations for better tensile properties. Multiple deformation twins, stacking faults and Lomer-Cottrell locks are the dominant deformation mechanisms for the unaged samples, while in-teractions between these defects and L1(2) nanoprecipitates play important roles in the aged sample, the shearing hardening mechanism is observed for L1(2) nano-particles. |
| Keyword | High entropy alloys Heterogeneous structures Precipitates Strain hardening Strengthening Ductility |
| DOI | 10.1016/j.msea.2021.142440 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000761672000002 |
| WOS Keyword | STRAIN-GRADIENT PLASTICITY ; SHORT-RANGE ORDER ; MECHANICAL-PROPERTIES ; THERMAL-STABILITY ; DEFORMATION ; CRCONI ; BEHAVIOR ; METALS ; IMPACT ; NANOPARTICLES |
| WOS Research Area | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Funding Project | National Key R&D Program of China[2017YFA0204402] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503] |
| Funding Organization | National Key R&D Program of China ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Strategic Priority Research Program of the Chinese Academy of Sciences |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Yuan, Fuping |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/88624 |
| Collection | 非线性力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Zhang ZH,Jiang P,Yuan FP,et al. Enhanced tensile properties by heterogeneous grain structures and coherent precipitates in a CoCrNi-based medium entropy alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2022,832:11.Rp_Au:Yuan, Fuping |
| APA | 张子晗,姜萍,袁福平,&武晓雷.(2022).Enhanced tensile properties by heterogeneous grain structures and coherent precipitates in a CoCrNi-based medium entropy alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,832,11. |
| MLA | 张子晗,et al."Enhanced tensile properties by heterogeneous grain structures and coherent precipitates in a CoCrNi-based medium entropy alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 832(2022):11. |
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| Jp2022F90.pdf（18568KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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