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本文研究了混合稀土的变质工艺和热处理对ZK102合金组织的影响。实验结果表明:混合稀土能变质共晶硅和细化α相组织,最佳变质工艺是铝箔包覆块状1.0％混合稀土加入到740℃铝液内,变质效果稳定;混合稀土的作用是封闭共晶硅孪晶生长台阶,同时又促使共晶硅形成孪晶,使共晶硅生长成分枝密集、互相交叉的短棒状;热处理能使变质共晶硅粒状速度加快,并减少稀土化合物相的数量。
In this paper, the effect of modification process and heat treatment of mixed rare earth on the microstructure of ZK102 alloy was studied. The experimental results show that the mixed metamorphic rare earths and the refined α-phase microstructure are the best metamorphism, the 1.0% mixed rare earth with aluminum foil coated block is added to the aluminum liquid at 740 ℃, and the metamorphic effect is stable. The effect of mixed rare earth is closed Eutectic silicon twin growth stage, but also prompted the formation of twin eutectic silicon, eutectic silicon grow into dense branches, intersecting the short rod-like; heat treatment can make eutectic silicon particles granularity accelerated and reduce the rare earth compound phase Quantity.