利用低过热度浇注和等温保温技术制备了半固态A356-Sc铝合金浆料,研究了Sc对所制备的半固态A356铝合金初生α相形貌和尺寸的影响.结果表明:细化处理的半固态A356-Sc铝合金经低过热度浇注和等温保温可制备具有球状和颗粒状初生d相的浆料,稀土Sc可显著改善A356铝合金中初生α相的尺寸和形貌.获得了制备半固态A356-Sc合金浆料合适的工艺条件:Sc加入量为0.6 mass％,保温温度为630℃,保温时间为200 s,此时,初生α相的等效圆直径达到36.48 μm,平均形状因子为0.85.探讨了Al-Sc共晶反应对半固态A356铝合金初生d相细化机理.
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