On the modification of hypereutectic Al-Si alloys using rare earth Er

作     者：Pengfei XING Bo GAO Yanxin ZHUANG Kaihua LIU Ganfeng TU 

作者机构：School of Materials and Metallurgy Northeastern University Shenyang 110819 China Key Laboratory of Electromagnetic Processing of Materials Northeastern University Shenyang 110819 China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2010年第23卷第5期

页      面：327-333页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by the National Key Technology R&D Program of China(No.2009BAE80B00) 

主　　题：Rare earth Er Al-Si alloy Microstructure Modification Rare earth Er A1-Si alloy Microstructure Modification 

摘      要：Hypereutectic Al-17.5Si （wt pct） and Al-25Si （wt pct） alloys with various content of rare earth Er were prepared by conventional casting technique. The effect of Er on the microstructure and properties of the hypereutectic Al-Si alloys was investigated using optical microscopy, scanning electron microscopy as well as friction and wear tests. It was found that optimal amount of Er exists in modifying the hypereutectic Al-Si alloys. An appropriate addition of Er improved the anti-wear properties, and reduced the friction coefficient of the hypereutectic Al-Si alloys studied. The primary silicon crystals in the hypereutectic Al-Si alloys were refined with the suitable addition of Er element. The modification mechanism was also discussed in this paper.