| Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn | |
| Li Wang1,2; Sun Qian1,2; Jiang Hongxiang1; Zhao Jiuzhou1,2 | |
| 通讯作者 | Zhao Jiuzhou(jzzhao@imr.ac.cn) |
| 2019-07-11 | |
| 发表期刊 | ACTA METALLURGICA SINICA
 |
| ISSN | 0412-1961 |
| 卷号 | 55期号:7页码:831-839 |
| 摘要 | Al-Bi alloy has a low friction coefficient and high wear-resistant properties and is a good self-lubricating material for advanced bearings in automotive applications if the soft Bi-rich phase is dispersedly distributed in the comparatively harder Al-based matrix. However, Al-Bi alloy is a typical immiscible alloy. When cooling a homogeneous single phase liquid of Al-Bi alloy in the miscibility gap, it transforms into two liquids. The liquid-liquid phase transformation generally leads to the formation of a phase segregated microstructure. In the last decades, considerable efforts have been made to study the solidification behavior of Al-Bi alloy. It is demonstrated that the microstructure evolution during the liquid-liquid decomposition is a result of concurrent actions of the nucleation, growth, Ostwald ripening and motions of the Bi-rich droplets. The nucleation and the immigration of the Bi-rich droplets show a dominant influence on the solidification microstructure of Al-Bi alloy. Enhancing the nucleation rate and reducing the Marangoni migration velocity of the Bi-rich droplets promote the formation of a well dispersed microstructure. Considering that addition of surface active element to the alloy may result in a reduction in the liquid-liquid interface energy, and thus reduce the nucleation energy barrier and Marangoni migration velocity of the Bi-rich droplets, the possibility to control the solidification process and microstructure of Al-Bi alloys by adding micro-alloying element Sn was investigated. The experimental results show that microalloying element Sn can cause an effective refinement of the Bi-rich particles. The refining effect increases with the increase of Bi content up to 0.10%Sn (mass fraciton). A model was developed to calculate the microstructure formation. The numerical results demonstrate that Sn can act as an effective surface active element for Al-Bi alloys and promote the formation of a well dispersed microstructure. |
| 关键词 | Al-Bi alloy solidification microalloying interfacial energy simulation |
| 资助者 | National Natural Science Foundation of China ; China Manned Space Engineering Project |
| DOI | 10.11900/0412.1961.2018.00450 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Natural Science Foundation of China[51471173] ; National Natural Science Foundation of China[51771210] ; National Natural Science Foundation of China[51501207] ; China Manned Space Engineering Project[TGJZ800-2-RW024] |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| WOS类目 | Metallurgy & Metallurgical Engineering |
| WOS记录号 | WOS:000471268000003 |
| 出版者 | SCIENCE PRESS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/134215 |
| 专题 | 中国科学院金属研究所 |
| 通讯作者 | Zhao Jiuzhou |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li Wang,Sun Qian,Jiang Hongxiang,et al. Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn[J]. ACTA METALLURGICA SINICA,2019,55(7):831-839. |
| APA | Li Wang,Sun Qian,Jiang Hongxiang,&Zhao Jiuzhou.(2019).Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn.ACTA METALLURGICA SINICA,55(7),831-839. |
| MLA | Li Wang,et al."Solidification of Al-Bi Alloy and Influence of Microalloying Element Sn".ACTA METALLURGICA SINICA 55.7(2019):831-839. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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