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在不同的过热度和电磁搅拌下制备了5%Mg2Si(质量分数)颗粒增强亚共晶Al-Si基复合材料,并研究了浇注温度(过热度)和电磁搅拌对初生α-Al、(α-Al+Mg2Si)共晶团和共晶Mg2Si形貌和尺寸大小的影响。结果表明,低过热度与电磁搅拌结合的工艺不仅能够细化初生α-Al、(α-Al+Mg2Si)共晶团的尺寸,促进它们非枝晶组织的形成,而且还细化了共晶Mg2Si,改变了(α-Al+Mg2Si)两元共晶的形核方式,从普通铸造条件下在初生α-Al上形核转变为低过热度与电磁搅拌下的初生α-Al晶间形核。
5% Mg2Si (mass fraction) particle reinforced hypoeutectic Al-Si matrix composites were prepared under different superheat and electromagnetic stirring, and the effects of pouring temperature (superheat degree) and electromagnetic stirring on the initial α-Al, -Al + Mg2Si) eutectic and eutectic Mg2Si morphology and size. The results show that the combination of low superheat and electromagnetic stirring can not only refine the sizes of primary α-Al and (α-Al + Mg2Si) eutectic groups and promote the formation of non-dendritic structure, but also refine the eutectic Mg2Si, changing the nucleation mode of (α-Al + Mg2Si) binary eutectic. The nucleation changes from primary α-Al to low superheat and the primary α-Al intergranular under electromagnetic stirring nuclear.