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。 A356 aluminum alloy was modified with rare earth Ce. Semi-solid slurry was prepared by forced convection mixing equipment (FCR) independently developed by laboratory, and the prepared slurry was squeeze cast. The effect of rare earth Ce on the microstructure and morphology of primary α-aluminum and eutectic silicon phases of A356 aluminum alloy was investigated. The effect of Ce content on the mechanical properties of rheo-extrusion was explored. The results showed that the addition of rare earth Ce refined the morphology of primary α-Al grains and eutectic silicon, and the refining effect was most obvious when the addition of rare earth Ce was 0.6%. When the mass fraction of Ce was 0.6% The tensile strength of the alloy reached 216 MPa and 299 MPa respectively at as-cast and T6 (solid solution at 535 ℃ for 8 h and aging at 155 ℃ for 5 h), which increased by 12.6% and 15.2% respectively compared with that without adding rare earth Ce, Elongation after T6 heat treatment has also been greatly improved.