The effects of erbium on the microstructure of a semisolid A356 alloy for thixoforming were investigated. Semisolid A356 alloys were prepared using the serpentine channel technique. The results demonstrated that a semisolid A356 alloy could be successfully produced. The addition of erbium refined the size of primary α-Al globules; moreover, the eutectic silicon phase was modified. The thermal analysis results showed that the addition of erbium decreased the amount of nucleation sites for eutectic phases, leading to increased undercooling of the melts. Therefore, erbium delays the nucleation of eutectic phases, resulting in refinement of the eutectic silicon phases. Moreover, the addition of erbium increased the rheocast quality index value of the semisolid A356 alloy, which is beneficial for thixoforming.

研究了on对触变成形半固态A356合金显微组织的影响。使用蛇形通道技术制备了半固态A356合金。结果表明，可以成功地生产半固态A356合金。的添加细化了初生α- Al球的大小；此外，共晶硅相被改性。热分析结果表明，添加addition减少了共晶相的成核位点数量，导致熔体的过冷度增加。因此，延迟了共晶相的成核作用，导致了共晶硅相的细化。此外，the的添加提高了半固态A356合金的流变质量指数值，这对触变成形是有益的。