| A hidden precipitation scenario of the theta'-phase in Al-Cu alloys | |
| Zhou, L.1; Wu, C. L.1; Xie, P.1; Niu, F. J.1; Ming, W. Q.1; Du, K.2; Chen, J. H.1 | |
| 通讯作者 | Wu, C. L.(cuilanwu@hnu.edu.cn) ; Chen, J. H.(jhchen123@hnu.edu.cn) |
| 2021-06-10 | |
| 发表期刊 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| ISSN | 1005-0302 |
| 卷号 | 75页码:126-138 |
| 摘要 | Al-Cu binary alloys are important and interesting industry materials. Up to date, the formation mechanisms of the key strengthening precipitates, named theta'-phase, in the alloys are still controversial. Here, we report that for non-deformed bulk Al-Cu alloys the theta'-phase actually has its own direct precursors that can form only at elevated aging temperature (> ca. 200 degrees C). These high-temperature precursors have the same plate-like morphology as the theta'-phase precipitates but rather different structures. Atomic-resolution imaging reveals that they have a tetragonal structure with a = 0.405 nm and c = 1.213 nm, and an average composition of Al5-xCu1+ x (0 <= x <1), being fully coherent with the Al-lattice. This precursor phase may initiate with a composition of Al5Cu and evolve locally towards Al4Cu2 in composition, eventually leading to a consequent structural transformation into the theta'-phase (Al4Cu2=Al2Cu). There are evidences that because of their genetic links in structure, such a high-temperature precursor may transform to the theta'-phase without having to change their morphology and interface structure. Our study reveals a well-defined and previously hidden precipitation scenario for the theta'-phase to form in Al-Cu alloys at an elevated aging temperature. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| 关键词 | AlCu alloy Age-hardening Precipitation Electron microscopy |
| 资助者 | National Natural Science Foundation of China ; National Key Research and Development Program of China |
| DOI | 10.1016/j.jmst.2020.09.039 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[51831004] ; National Natural Science Foundation of China[51801060] ; National Natural Science Foundation of China[51671082] ; National Natural Science Foundation of China[11427806] ; National Natural Science Foundation of China[51471067] ; National Key Research and Development Program of China[2016YFB0300801] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS类目 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS记录号 | WOS:000640021600014 |
| 出版者 | JOURNAL MATER SCI TECHNOL |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/162225 |
| 专题 | 中国科学院金属研究所 |
| 通讯作者 | Wu, C. L.; Chen, J. H. |
| 作者单位 | 1.Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Hunan, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, L.,Wu, C. L.,Xie, P.,et al. A hidden precipitation scenario of the theta'-phase in Al-Cu alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,75:126-138. |
| APA | Zhou, L..,Wu, C. L..,Xie, P..,Niu, F. J..,Ming, W. Q..,...&Chen, J. H..(2021).A hidden precipitation scenario of the theta'-phase in Al-Cu alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,75,126-138. |
| MLA | Zhou, L.,et al."A hidden precipitation scenario of the theta'-phase in Al-Cu alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 75(2021):126-138. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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