铸造AlSi7MgLa铝合金的金相组织和力学性能研究  

Study on Microstructure and Mechanical Properties of Cast AlSi7MgLa Aluminum Alloy

作　　者：闫洪[1] 张辉[2] 杨祖贵[1] 

机构地区：[1]昆明冶金研究院,云南昆明650000 [2]云南铝业股份有限公司,云南昆明650502

出　　处：《新技术新工艺》2016年第9期61-63,共3页New Technology & New Process

基　　金：云南省社会发展科技计划-科研院所技术开发研究专项项目(2011CF009)

摘　　要：在铸造铝合金中,添加稀土元素镧可以起到明显的效果。通过Al-9.38%La稀土铝中间合金向铝合金熔体加入稀土元素镧,制得了铸造AlSi7MgLa铝合金。用金相显微镜和电子万能材料试验机研究了铸造AlSi7MgLa铝合金的金相组织和力学性能,结果表明,稀土元素镧能改变共晶硅的形貌,当稀土元素镧的加入量为0.31%时,共晶硅形成细小的颗粒状,合金的强度较高,为116 MPa。当稀土元素镧加入量为0.87%时,有比共晶硅粗大的稀土元素镧相析出,降低了合金的力学性能,合金的强度进一步下降到52 MPa。Addition of rare earth element La in cast aluminum alloy plays an important role. The rare earth element La is added to the aluminum alloy melt through the A1-9.38%La rare aluminum alloy, and the A1SiTMgLa cast aluminum alloy is obtained. The microstructure and mechanical property of A1SiTMgLa alloy is studied by metallographie microscope and electronic universal material testing machine. Results show that the morphology of eutectic silicon is changed by rare earth La. When the addition of rare earth La is 0.31% , eutectic silicon forms a fine particle. The strength of the alloy is high to 116 MPa. When the amount of La is 0.87%, there is La phase separation more than eutectic silicon, and the mechanical property of alloy is decreased. The strength of the alloy is decreased further to 52 MPa.

关 键 词：AlSi7MgLa铝合金 金相组织 力学性能 

分 类 号：TG244[金属学及工艺—铸造]