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提出一种新的亚共晶铝硅合金半固态坯料制备方法 ,即再熔融加热制备法 ,其特点是不对熔融金属施加任何机械的或电磁的搅拌力 ,而是通过在金属凝固过程中进行再熔融加热 ,获得具有近球状初晶相的亚共晶铝硅合金半固态组织。研究了Al 7%Si 0 .2 %Ti半固态合金再熔融加热制备过程中再熔融温度及保温时间等关键工艺参数对半固态组织的影响 ,并讨论了再熔融加热对半固态组织演变的影响。
A new preparation method of semi-solid billet of hypoeutectic Al-Si alloy is proposed, that is, the method of remelting and heating, which is characterized by not applying any mechanical or electromagnetic stirring force to the molten metal, Melting and heating, to obtain a nearly spherical primary crystal phase of hypoeutectic Al-Si alloy semi-solid microstructure. The effects of remelting temperature and holding time on the microstructure of Al 7% Si 0 .2% Ti alloy during remelting were investigated. The effect of remelting heating on the microstructure evolution was also discussed .