稀土铒对过共晶Al-18Si合金组织及摩擦磨损性能的影响  

Effects of Er on Microstructure and Friction Wear Property of Hypereutectic Al-18Si Alloy

作　　者：梁国栋[1] 刘军辉[1] 占维[2] LIGNG Guodong;LIU Junhui;ZHAN Wei(College of Mechanical and Electrical Engineering, Heyuan Polytechnic, Heyuan 517000, China;School of Aeronautical Manufacture Engineering, Nanchang Hangkong University,Nanchang 330063, China)

机构地区：[1]河源职业技术学院机电工程学院,广东河源517000 [2]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《铸造技术》2018年第6期1208-1210,共3页Foundry Technology

基　　金：广东省优秀青年教师培养项目(GDYQ2016156)

摘　　要：研究了稀土Er对Al-18Si合金的组织和摩擦磨损性能的影响。结果表明,Er对Al-18Si合金中的初晶和共晶硅相均具有良好的变质作用。经Er变质后,合金中的初晶硅由粗大的板片状或多边形状转变为较小的多边形状或颗粒状,共晶硅也由粗大的长针状转变为细小的颗粒状。经Er变质后,Al-18Si合金的耐磨性能显著提高。磨损表面分析表明,当载荷为160 N时,未变质合金的磨损机制为严重的粘着磨损,而变质后合金的磨损机制为磨粒磨损为主并有少量粘着磨损。Effects of Er on microstructure and friction wear property of hypereutectic Al-18Si alloy were studied. The results show that both the primary and eutectic silicon are modification with Er addition. The primary silicon in the modification alloy change from coarse and irregular became freer and rounder. Moreover, fine particle-like eutectic silicon is also formed in the modification alloy. The wear resistance of Al-18Si alloy modification with Er is significantly superior to that unmodified alloy. The analysis of worn surface indicate that the wear mechanism of the unmodification alloy is adhesive wear, while it mainly exhibite abrasive wear with slight adhesive wear in the modification alloy at high normal load of 160 N.

关 键 词：ER Al-18Si合金 变质 组织 摩擦性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]