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| Effect of Ce Contents on Microstructure and Mechanical Properties of Al-Si-Sc-Ce Alloys Prepared by Molten Salt Electrolysis |
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Received:September 15, 2022
Revised:September 25, 2022
Accepted:September 27, 2022
Published Online:January 09, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.02.014 |
| KeyWord:molten salt electrolysis; aluminum alloy; rare earth; microstructure; mechanical properties |
| Author | Institution |
| GUO Hao |
北京科技大学 |
| LIU Xuan |
北京科技大学 |
| WANG Zeng-jie |
北京工业大学材料与制造学部 |
| LI Xiang |
北京科技大学 |
| CAO Zhan-min |
北京科技大学 |
| XUE Ji-lai |
北京科技大学 |
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| Abstract: |
| Al-Si-Sc-Ce alloys with various Ce contents were prepared by molten salt electrolysis for studying their microstructure and mechanical properties. It is found that Ce refines the alloys with turning the primary α-Al from dendrite into round structure, and AlSi2Sc2 phase from long flake-like into network-like (their length from 1 000 μm down to 200-500 μm). The morphology of eutectic Si changes from plate-like into fiber-like, with drops in average area, roundness and average length of Si particles. A ternary CeAl2Si2 phase is also formed via eutectic reaction in the alloys. The microhardness of Al-7Si-0.79Sc-0.62Ce alloys is higher than that of Al-7Si-0.82Sc alloys, where the hardness values of the eutectic Si, Sc-containing and Ce-containing phases rise by 8.5%, 49.7% and 99.3 %, respectively. The mechanism for such improvement is related to Ce induced refinement. |
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