Effect of Y2O3 on microstructure and mechanical properties of hypereutectic Al-20%Si alloy

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. A03; pp. 1332 - 1335
• Main Author: 杨亚锋 许长林 王慧远 文0畅 姜启川
• Format: Journal Article
• Language: English
• Published: Key Laboratory of Automobile Materials of Ministry of Education,Department of Materials Science and Engineering, Jilin University, Changchun 130025, China 01.12.2006
• Subjects: 微观结构; 机械性能; 过共晶体; eutectic silicon; primary silicon; heat treatment; modification; mechanical properties; hypereutectic Al-Si alloy
• ISSN: 1003-6326

The effect of Y203 on the microstructure and mechanical properties of the hypereutectic Al-20%Si（mass fraction） alloy was investigated. The results show that, with the addition of Y203 into the Al-P-Ti-TiC modifier, the average size of primary silicon in the Al-20%Si alloy modified by Al-P-Ti-TiC-Y203 modifier （approximately 15μm or less） is significantly reduced, and the morphology of eutectic silicon changes from coarse acicular and plate like to refined fibrous. The Brinell hardness （HB189） and tensile strength （301 MPa） of Al-20%Si alloy modified by the Al-P-Ti-TiC-Y2O3 increase by 11.6% and 10.7%, respectively, for the alloys aider heat treatment.