a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b
文献类型：期刊论文
| 作者 | Li, N.1,2; Wu, L. H.1,2; Zhang, H.1,2; Xue, P.1,2; Liu, F. C.1; Ni, D. R.1,2; Xiao, B. L.1,2; Ma, Z. Y.1,2 |
| 刊名 | MATERIALS CHARACTERIZATION
 |
| 出版日期 | 2024-06-01 |
| 卷号 | 212页码:11 |
| 关键词 | High entropy alloys Friction stir processing Grain boundary sliding Cr-rich phase |
| ISSN号 | 1044-5803 |
| DOI | 10.1016/j.matchar.2024.113970 |
| 通讯作者 | Wu, L. H.(lhwu@imr.ac.cn) |
| 英文摘要 | Since superplastic formation offers a significant advantage in preparing the complex structure parts of HEAs, the study of their superplastic behavior is extremely important. Using friction stir processing (FSP) with an improved convex hemispherical shape tool, this study reported for the first time an equiaxed ultrafine-grained CoCrFeNiMn HEA (489 nm) with a maximum elongation of 870% at 675 degrees C and 3 x 10-4 s-1. This superplastic property is much larger than ever reported in the CoCrFeNiMn HEA, which is even larger than that of the nano-sized CoCrFeNiMn HEA (10 nm) prepared by the high-pressure torsion. A high proportion of high angle grain boundaries and twin boundaries, a hard Cr-rich phase, and the sluggish diffusion effect of the CoCrFeNiMn HEA were primarily responsible for the exceptional superplasticity. Additionally, this study provides the first elucidation of the mechanism underlying Cr precipitation and Cr-rich phase growth, as well as the function of lowenergy annealed twins during superplastic deformation. The diffusion of Cr along dislocations and grain boundaries facilitated grain boundary sliding as the predominant deformation mechanism. This study elucidates the superplastic deformation mechanism and microstructure evolution, thereby furnishing theoretical guidance for the practical implementation of superplastic forming of complex components of HEAs. Additionally, it presents an efficient method for fabricating such components. |
| 资助项目 | National Natural Science Foundation of China[52271043] ; National Natural Science Foundation of China[51975553] ; Youth Innova- tion Promotion Association of the Chinese Academy of Sciences[2021193] ; Liaoning Revitalization Talents Program[XLYC2002099] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001240836900001 |
| 出版者 | ELSEVIER SCIENCE INC |
| 资助机构 | National Natural Science Foundation of China ; Youth Innova- tion Promotion Association of the Chinese Academy of Sciences ; Liaoning Revitalization Talents Program |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Wu, L. H. |
| 作者单位 | 1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, N.,Wu, L. H.,Zhang, H.,et al. a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b[J]. MATERIALS CHARACTERIZATION,2024,212:11. |
| APA | Li, N..,Wu, L. H..,Zhang, H..,Xue, P..,Liu, F. C..,...&Ma, Z. Y..(2024).a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b.MATERIALS CHARACTERIZATION,212,11. |
| MLA | Li, N.,et al."a,b , a,b,* , a,b , a,b , a , a,b , a,b , a,b".MATERIALS CHARACTERIZATION 212(2024):11. |
入库方式： OAI收割
来源：金属研究所
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