La和Ce对铸造Al-7Si-0.6Cu-0.8Fe合金组织及性能的影响  

Effects of La and Ce on the Microstructure and Properties of Cast Al-7Si-0.6Cu-0.8FeAlloy

作　　者：吴顺意 葛富彪 甘培原 胡振光 黎永生 谭海军[1] Wu Shunyi;Ge Fubiao;Gan Peiyuan;Hu Zhenguang;Li Yongsheng;Tan Haiju(College of Chemistry and Bioengineering,Guilin University of Technology;Nanning Gult Education Technology Co.,Ltd.;Guangxi Branch of Chinese Science and Technology Development Institute)

机构地区：[1]桂林理工大学化学与生物工程学院,南宁530004 [2]南宁市桂工教育科技有限公司,广西桂林541006 [3]中国科技开发院广西分院

出　　处：《特种铸造及有色合金》2023年第4期529-535,共7页Special Casting & Nonferrous Alloys

基　　金：广西电磁化学功能物质重点实验室开放课题资助项目(RZ2100001194)。

摘　　要：采用光学显微镜、扫描电镜和激光导热等手段,研究了单独或复合添加La、Ce对铸造Al-7Si-0.6Cu-0.8Fe合金微观组织、力学性能和热导率的影响。结果表明,添加0.3%的(La+Ce)后,合金中α-Al相得到了较大程度的细化,二次枝晶臂间距(SADS)达到较小值(13.1μm),共晶Si形貌转化为细小的颗粒状且均匀地分布于晶界处,富Fe相长度降低了57.51%,其合金的热导率为159.68 W/(m·K)、抗拉强度为231.3 MPa、伸长率为6.89%,与未添加稀土合金相比,分别提高了13.79%、24.96%和118.73%。The effects of microstructure,mechanical properties and thermal conductivity of cast Al-7Si-0.6Cu-O.8Fe alloy were investigated with single or compound addition of La and Ce by means of optical microscope,scanning electron microscope and laser flash apparatus.The results indicate that the alloy with 0.3%(La+Ce)addition,theα-Al phase is refined to a greater extent,and the secondary dendrite arm spacing(SDAS)achieves a minimum value of 13.1μm.In additon,the morphology of eutectic Si is transformed into fine particles and uniformly distributed at the grain boundaries,and the length of Fe-rich phase is reduced by 57.51%.Where the thermal conductivity is 159.68 W/(m·K),tensile strength is 231.3 MPa,and elongation is 6.89%,which are increased by 13.79%,24.96%and 118.73%,respectively compared with the alloy without rare earth addition.

关 键 词：Al-7Si-0.6Cu-0.8Fe合金 La和Ce 热导率 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]