| 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)
|
| 通讯作者 | Yuan, Fuping([email protected])
|
| 发表期刊 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| 2022-01-14
|
| 卷号 | 832页码:11 |
| ISSN | 0921-5093
|
| 摘要 | 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. |
| 关键词 | High entropy alloys
Heterogeneous structures
Precipitates
Strain hardening
Strengthening
Ductility
|
| DOI | 10.1016/j.msea.2021.142440
|
| 收录类别 | SCI
; EI
|
| 语种 | 英语
|
| WOS记录号 | WOS:000761672000002
|
| 关键词[WOS] | STRAIN-GRADIENT PLASTICITY
; SHORT-RANGE ORDER
; MECHANICAL-PROPERTIES
; THERMAL-STABILITY
; DEFORMATION
; CRCONI
; BEHAVIOR
; METALS
; IMPACT
; NANOPARTICLES
|
| WOS研究方向 | Science & Technology - Other Topics
; Materials Science
; Metallurgy & Metallurgical Engineering
|
| WOS类目 | Nanoscience & Nanotechnology
; Materials Science, Multidisciplinary
; Metallurgy & Metallurgical Engineering
|
| 资助项目 | 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]
|
| 项目资助者 | 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
|
| 论文分区 | 一类
|
| 力学所作者排名 | 1
|
| RpAuthor | Yuan, Fuping
|
| 引用统计 |
|
| 文献类型 | 期刊论文
|
| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/88624
|
| 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,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.
|
修改评论