稀土Ce对半固态A356合金流变挤压组织性能影响  

Influence of cerium on the microstructure and mechanical properties of semisolid A356 alloy produced by rheo-extrusion casting process

作　　者：廖万能 康永林[1] 祁明凡 闻玉辉[1] LIAO Wan-neng KANG Yong-lin QI Ming-fan WEN Yu-hui(School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《物理测试》2017年第1期8-13,共6页Physics Examination and Testing

基　　金：广东省省级科技计划项目(2013B091300016)

摘　　要：采用稀土Ce对A356铝合金进行了变质处理,利用实验室自主研发的强制对流搅拌设备(FCR)制备半固态浆料,将制备的浆料进行挤压铸造。研究了稀土Ce对半固态流变挤压A356铝合金初生α铝相和共晶硅相组织形貌的影响,并探索了Ce含量对流变挤压件力学性能的影响。研究结果表明,稀土Ce的添加细化了初生α铝晶粒和共晶硅相形貌,并且稀土Ce的添加量在0.6%时细化效果最明显;当Ce的质量分数为0.6%时,合金在铸态和T6(535℃固溶8 h+155℃时效5 h)状态下的抗拉强度分别达到了216 MPa和299 MPa,比未添加稀土Ce时分别提高了12.6%和15.2%,伸长率在T6热处理之后也得到了大幅度的改善。The semisolid slurry of A356,modified by cerium,was manufactured by self-developed forced convection rheoforming machine（FCR）,then the slurry was squeeze casting.Influences of cerium on the primary α-Al phases,eutectic silicon phases and mechanical properties of semisolid A356 alloy produced by rheo-extrusion casting process were researched.The results indicated that the addition of cerium modified the α-Al grains and eutectic silicon phases.When the content of cerium was 0.6%,the refining effect was the best,and the tensile strength of A356 alloy reached 216 MPa and 299 MPa,respectively,in the as-cast and T6 state,which was increased 12.6% and 15.2%,respectively,compared with the alloy without adding cerium element.Moreover,the elongation of A356 was greatly improved after the T6 heat treatment.

关 键 词：A356铝合金 CE 半固态 变质处理 组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]