Designing structures with combined gradients of grain size and precipitation in high entropy alloys for simultaneous improvement of strength and ductility & nbsp;
文献类型：期刊论文
| 作者 | Qin, Shuang3 ; Yang, Muxin3; Jiang, Ping3; Wang, Jian2,3; Wu, Xiaolei2,3; Zhou, Hao1; Yuan, Fuping2,3; Jiang P(姜萍); Wu XL(武晓雷); Yuan FP(袁福平)
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| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2022-05-15 |
| 卷号 | 230页码:11 |
| 关键词 | High-entropy alloys Gradient structures Precipitates Strain hardening Strengthening Ductility |
| ISSN号 | 1359-6454 |
| DOI | 10.1016/j.actamat.2022.117847 |
| 通讯作者 | Yuan, Fuping(fpyuan@lnm.imech.ac.cn) |
| 英文摘要 | Suppressing the early strain localization at the nanostructured topmost layer is crucial for achieving better tensile ductility in the gradient structure. Thus, structures with combined gradient distributions along the depth for both grain size and volume fraction of precipitates were designed and introduced in a high entropy alloy by surface mechanical attrition treatment and aging. Yield strength and uniform elongation were observed to be simultaneously improved in the structures with combined gradients as compared to the corresponding structures with only grain size gradient. More severe strain gradients and higher density of geometrically necessary dislocations were observed to be produced at various domain boundaries in the structures with combined gradients, resulting in stronger hetero-deformation-induced (HDI) extra hardening for better tensile properties. Shearing and bowing hardening mechanisms were observed for L1( 2) and B2 precipitates, respectively. Higher volume fractions of B2 and L1( 2) phases at the topmost layer induce stronger precipitation hardening, which compensates the diminished strain hardening due to the reduced grain size at the topmost layer for better tensile ductility in the structures with combined gradients. The observed higher yield strength in the structures with combined gradients have been discussed based on mechanisms of dislocation strengthening, precipitation strengthening and HDI strengthening. (C)& nbsp;2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.& nbsp; |
| WOS关键词 | SHORT-RANGE ORDER ; MECHANICAL-PROPERTIES ; LATTICE DISTORTION ; THERMAL-STABILITY ; CHEMICAL-ORDER ; CRCONI ; DEFORMATION ; IMPACT ; PLASTICITY ; DUCTILITY |
| 资助项目 | National Key R&D Program of China[2017YFA0204402] ; NSFC Basic Sci-ence Center Program[11988102] ; National Natural Science Foundation of China[11790293] ; National Natural Science Foundation of China[52192591] ; China Postdoctoral Science Foundation[2021M703292] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000791271900008 |
| 资助机构 | National Key R&D Program of China ; NSFC Basic Sci-ence Center Program ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; Strategic Priority Research Program of the Chinese Academy of Sciences |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/89348]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Yuan, Fuping |
| 作者单位 | 1.Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 |
Qin, Shuang,Yang, Muxin,Jiang, Ping,et al. Designing structures with combined gradients of grain size and precipitation in high entropy alloys for simultaneous improvement of strength and ductility & nbsp; [J]. ACTA MATERIALIA,2022,230:11. |
| APA |
Qin, Shuang.,Yang, Muxin.,Jiang, Ping.,Wang, Jian.,Wu, Xiaolei.,...&Wang J.(2022). Designing structures with combined gradients of grain size and precipitation in high entropy alloys for simultaneous improvement of strength and ductility & nbsp; .ACTA MATERIALIA,230,11. |
| MLA |
Qin, Shuang,et al." Designing structures with combined gradients of grain size and precipitation in high entropy alloys for simultaneous improvement of strength and ductility & nbsp; ".ACTA MATERIALIA 230(2022):11. |
入库方式： OAI收割
来源：力学研究所
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