| Effect of trace rare earth La on microstructure and properties of Al-7%Si-0.6%Fe alloy | |
| Qi Zhong-Yi1,2; Wang Bo2; Jiang Hong-Xiang2; Zhang Li-Li2; He Jie2 | |
| 通讯作者 | Jiang Hong-Xiang(hxjiang@imr.ac.cn) ; He Jie(jiehe@imr.ac.cn) |
| 2024-04-05 | |
| 发表期刊 | ACTA PHYSICA SINICA
 |
| ISSN | 1000-3290 |
| 卷号 | 73期号:7页码:11 |
| 摘要 | Al-Si alloys have been widely used in electronic information, communication, and other fields because of their high specific strength, excellent castability and good thermal conductivity. In recent years, with the rapid development of 5G communication technology, electronic communication equipment is gradually developing towards high integration and lightweight. The power of related equipment is higher and higher, which puts forward higher requirements for thermal conductivity and mechanical properties of materials. Si can improve the fluidity and strength of the Al-Si alloy, but a large amount of Si will aggravate the lattice distortion and increases amount of eutectic Si. This will reduce the plasticity of the alloy, increase the electron scattering and reduce the thermal conductivity. In order to improve the mechanical properties and thermal conductivity of Al-Si alloys, chemical inoculation is generally used. Sr is usually used as modifier and Al-B serves as grain refiner. However, the simultaneous addition of Sr and B into Al-Si alloy results in "poisoning" phenomenon, it becomes impossible to refine alpha-Al grains and modify eutectic Si simultaneously. In recent years, rare earth La has attracted more and more attention in improving the properties of aluminum alloys. However, previous studies mainly focused on the effects of La addition, consequently, the research on the effects of combined addition of La, Sr, B on the microstructure and properties of Al-7%Si-0.6%Fe alloy is lacking. In this work, solidification experiments are performed to investigate the effects of combined addition of La, Sr, B on the microstructure and properties of Al-7%Si-0.6%Fe alloy. The results show that the addition of trace rare earth La can effectively eliminate the poisoning effect of Sr and B, and enhance the modification effect of eutectic Si. Besides, the addition of La can promote the formation of alpha-Al heterogeneous nucleation substrate LaB6 and La can be used as a surfactant to reduce the undercooling of alpha-Al nucleation, thus it refines alpha-Al grains. The thermal conductivity of the alloy is significantly improved when the addition of La ranges from 0.02% to 0.06%; with the further increase of La addition, LaAlSi intermetallic compounds are formed in the alloy, leading the thermal conductivity of the alloy to decrease. |
| 关键词 | Al-Si alloys micro-alloying element La solidification microstructure thermal conductivity |
| 资助者 | Science and Technology Major Project of Guangxi Province, China ; National Natural Science Foundation of China ; Space Utilization System of China Manned Space Engineering ; Science and Technology Project of Fujian Province, China |
| DOI | 10.7498/aps.73.20231939 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Science and Technology Major Project of Guangxi Province, China[AA23023032] ; National Natural Science Foundation of China[52174380] ; National Natural Science Foundation of China[51974288] ; Space Utilization System of China Manned Space Engineering[KJZ-YY-NCL06] ; Science and Technology Project of Fujian Province, China[2021T3030] ; Science and Technology Project of Fujian Province, China[2020T3037] |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Multidisciplinary |
| WOS记录号 | WOS:001208803400025 |
| 出版者 | CHINESE PHYSICAL SOC |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/185886 |
| 专题 | 中国科学院金属研究所 |
| 通讯作者 | Jiang Hong-Xiang; He Jie |
| 作者单位 | 1.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qi Zhong-Yi,Wang Bo,Jiang Hong-Xiang,et al. Effect of trace rare earth La on microstructure and properties of Al-7%Si-0.6%Fe alloy[J]. ACTA PHYSICA SINICA,2024,73(7):11. |
| APA | Qi Zhong-Yi,Wang Bo,Jiang Hong-Xiang,Zhang Li-Li,&He Jie.(2024).Effect of trace rare earth La on microstructure and properties of Al-7%Si-0.6%Fe alloy.ACTA PHYSICA SINICA,73(7),11. |
| MLA | Qi Zhong-Yi,et al."Effect of trace rare earth La on microstructure and properties of Al-7%Si-0.6%Fe alloy".ACTA PHYSICA SINICA 73.7(2024):11. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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