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通过对凝固冷却速度分别为96K/s和3K/s的阶梯模具制备的A356铝合金在540°C下进行固溶热处理,观察和分析该合金经过不同时间固溶处理后共晶硅形貌和拉伸性能的变化,研究凝固冷却速率对A356铝合金固溶热处理的影响。结果表明,凝固过程的冷速不仅能有效地改变合金中共晶硅的形貌,而且高的凝固冷速能缩短合金的固溶热处理时间、加速共晶硅形貌的演变和提高拉伸性能。而A356铝合金中共晶硅的断裂、球化和粗化行为在固溶热处理过程中通过先后两个阶段完成:首先主要是共晶硅的断裂和球化,随后是共晶硅的粗化。
A356 aluminum alloy prepared by step mold with solidification cooling rate of 96K / s and 3K / s respectively was subjected to solution heat treatment at 540 ° C. The eutectic silicon morphology after solution treatment at different times was observed and analyzed. Tensile properties of the A356 aluminum alloy solution heat treatment effect of solidification cooling rate. The results show that the cooling rate of the solidification process can not only effectively change the morphology of the eutectic silicon in the alloy, but also the high solidification cooling rate can shorten the solution heat treatment time of the alloy, accelerate the evolution of eutectic silicon morphology and improve the tensile properties. However, the fracture, spheroidization and coarsening behavior of eutectic silicon in A356 aluminum alloy are solved in two stages by the solution heat treatment: the first is mainly the fracture and spheroidization of eutectic silicon, followed by the coarsening of eutectic silicon.