| Slow precipitate coarsening kinetics in extremely fine nanograined Ni-Cr alloys | |
| Zhang, B.1,2; Luo, Z. P.1; Li, X. Y.1 | |
| 通讯作者 | Luo, Z. P.(zpluo@imr.ac.cn) |
| 2024-08-01 | |
| 发表期刊 | ACTA MATERIALIA
 |
| ISSN | 1359-6454 |
| 卷号 | 274页码:12 |
| 摘要 | Grain boundaries significantly influence the nucleation and growth of precipitates in supersaturated solid solutions. However, due to the inherent instability of grain boundaries in nanograined metals, the precipitation process usually occurs concurrently with grain growth during thermal annealing, making it difficult to reveal the grain size effect on the precipitate coarsening behavior. In this study, nanograined Ni -48 Cr (at.%) supersaturated alloys with grain sizes ranging from about 85 nm to 10 nm were fabricated by plastic deformation, in which the relaxed grain boundaries led to the extremely fine nanograined structure having good thermal stability. During the high-temperature annealing process, nanoscale Cr particles were precipitated from the nanograined matrix, forming a nanograined dual-phase structure. The growth kinetics of the Cr precipitates in the extremely fine nanograined structures are different from the larger grain size samples, showing a trend that the smaller the asdeformed grain size, the slower the precipitate coarsening rate. Detailed microstructural characterization and kinetic analysis indicate that the extremely fine nanograined structure may change the rate-limiting process for precipitate coarsening from lattice diffusion to grain boundary diffusion as grain size is refined to about a few tens nanometers, which leads to a slow coarsening rate. The nanograined dual-phase Ni-Cr alloy of the annealed 10 nm sample shows the highest strength among these samples as well as excellent thermal stability, which provides guidance for the design of high -performance alloys. |
| 关键词 | Nanograined metals Precipitate coarsening Plastic deformation Thermal stability Strengthening |
| 资助者 | Strategic Priority Research Pro- gram of the Chinese Academy of Sciences ; National Science Foundation of China |
| DOI | 10.1016/j.actamat.2024.119984 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Strategic Priority Research Pro- gram of the Chinese Academy of Sciences[XDB0510100] ; National Science Foundation of China[52371125] ; National Science Foundation of China[52225102] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS类目 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS记录号 | WOS:001243476600001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/186854 |
| 专题 | 中国科学院金属研究所 |
| 通讯作者 | Luo, Z. P. |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, B.,Luo, Z. P.,Li, X. Y.. Slow precipitate coarsening kinetics in extremely fine nanograined Ni-Cr alloys[J]. ACTA MATERIALIA,2024,274:12. |
| APA | Zhang, B.,Luo, Z. P.,&Li, X. Y..(2024).Slow precipitate coarsening kinetics in extremely fine nanograined Ni-Cr alloys.ACTA MATERIALIA,274,12. |
| MLA | Zhang, B.,et al."Slow precipitate coarsening kinetics in extremely fine nanograined Ni-Cr alloys".ACTA MATERIALIA 274(2024):12. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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