Sr+Er复合变质对AlSi10MnMg合金微观组织、导热及力学性能的影响  

Effect of Sr+Er Composite Modification on Microstructure,Thermal Conductivity and Mechanical Properties of AlSi10MnMg Alloy

作　　者：刘文憬 李元东[1,2] 宋赵熙 毕广利[1,2] 杨昊坤 曹杨婧 LIU Wenjing;LI Yuandong;SONG Zhaoxi;BI Guangli;YANG Haokun;CAO Yangjing(State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Nonferrous Metal Alloys and Processing,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《材料导报》2023年第6期127-133,共7页Materials Reports

基　　金：重点研发计划资助项目(2018YFB2001800)。

摘　　要：本工作以AlSi10MnMg为基础合金,通过添加Sr、Er的方法对合金进行复合变质处理,研究不同添加量下Sr、Er对AlSi10MnMg合金微观组织、导热性能、力学性能的影响规律,力图实现AlSi10MnMg合金导热、力学性功能一体化。结果表明:在金属型铸造工艺下,添加Sr能够有效改善合金中共晶Si形貌,在此基础上添加稀土元素Er能够在改善共晶Si形貌的同时进一步细化共晶Si。此外,Sr、Er能够细化AlSi10MnMg合金中α-Al的二次枝晶间距,进而提升合金的导热性能及力学性能。当添加0.05%Sr+0.3%Er时,合金变质效果及性能提升最显著,相比未变质的合金,其二次枝晶间距降幅达到67.3%,共晶Si长宽比降幅达到46.1%。性能方面,合金导热率提升17.4%,达到179.32 W/(m·K);磨损性能提升11.2%;抗拉强度提升34.58%,达到221.96 MPa;伸长率提升104.48%,达到15.97%。In this work,AlSi10MnMg was used as the base alloy,and the alloy was subjected to compound modification treatment by adding Sr and Er.The influence of Sr and Er on the microstructure,thermal conductivity and mechanical properties of AlSi10MnMg alloy under different additions was studied,to realize the integration of thermal conductivity and mechanical function of AlSi10MnMg alloy.The results show that the addition of Sr can effectively improve the eutectic Si morphology of the alloy under the metal mold casting process.On this basis,the addition of rare earth element Er can improve the eutectic Si morphology and further refine the eutectic Si.In addition,Sr and Er can refine the secondary dendrite arm spacing ofα-Al in the AlSi10MnMg alloy,thereby improving the thermal conductivity and mechanical properties of the alloy.Compared with the unmodified alloy,the secondary dendrite spacing decreased by 67.3%,and the eutectic Si aspect ratio decreased by 46.1%;in terms of performance,the thermal conductivity increased by 17.4%to 179.32 W/(m·K);the wear performance improved 11.2%;tensile strength increased by 34.58%to 221.96 MPa;elongation increased by 104.48%to 15.97%.

关 键 词：AlSi10MnMg铝合金 Sr+Er 导热性能 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]