La和Ce对Al-3Si-0.5Cu-0.7Fe合金组织及性能的影响  

Effects of La and Ce on the Microstructure and Properties of Al-3Si-0.5Cu-0.7Fe Alloy

作　　者：葛富彪 胡振光 谭海军[1] 甘培原 韦德仕 秦文忠 Ge Fubiao;Hu Zhenguang;Tan Haijun;Gan Peiyuan;Wei Deshi;Qin Wenzhong(College of Chemistry and Bioengineering,Guilin University of Technology;Chinalco Guangxi Nonferrous Rare Earth Development Co.,Ltd.;Guangxi Guorui Rare Scandium New Material Technology Co.,Ltd.)

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541006 [2]中铝广西有色稀土开发有限公司 [3]广西国瑞稀钪新材料科技有限公司

出　　处：《特种铸造及有色合金》2022年第4期486-491,共6页Special Casting & Nonferrous Alloys

基　　金：广西科技重大专项基金资助项目(桂科AA17204036)

摘　　要：通过光学显微镜(OM)、扫描电镜(SEM)和拉伸测试等手段,研究了单独或复合添加La、Ce对Al-3Si-0.5Cu-0.7Fe铸造铝合金热导率、组织和力学性能的影响。结果表明,随着稀土含量增加,合金组织逐渐细化,热导率和力学性能有所提高。当复合添加0.3%的(La+Ce)时,合金中粗大的初生α-Al相枝晶变得较为细小,共晶Si由块状和板条状转变为颗粒状,初生α-Al相的二次枝晶臂间距(SADS)达到较小值(27.32μm),合金的热导率为170.67 W/(m·K),抗拉强度为245.4 MPa,伸长率为19.8%,与未添加稀土合金时相比,分别提高了7.72%、31.74%和74.24%。The effects of single or compound addition of La and Ce on thermal conductivity,microstructure and mechanical properties of Al-3 Si-0.5 Cu-0.7 Fe casting alloys were investigated by optical microscope,SEM and tensile testing.The results indicate that the microstructure of alloys is gradually refined,and the thermal conductivity and mechanical properties of the alloy are improved with the increase of rare earth content.After compound addition of 0.3%(La+Ce),the coarse dendritic of primaryα-Al phases become fine,and the morphology of eutectic silicon is transformed from bulk-like shape and strip-like shape into particle-like shape,where secondary dendrite arm spacing(SDAS)ofα-Al phases reach the minimum(27.32μm).The thermal conductivity,tensile strength and elongation of the alloy reach up to 170.67 W/(m·K),245.4 MPa and 19.8%,respectively,increased by 7.72%,31.74%and 74.24%,compared with those of ones without rare earth addition.

关 键 词：Al-3Si-0.5Cu-0.7Fe合金 La+Ce 热导率 组织 力学性能 

分 类 号：TN40[电子电信—微电子学与固体电子学] TG146.21[一般工业技术—材料科学与工程]