采用光学显微镜、扫描电镜及能谱分析术研究了复合添加微量Cr、Mn、Ti、Zr细化7A55合金铸锭组织的效果和机理.结果表明:复合添加0.04%Ti+0.17%Zr能在一定程度上细化7A55合金铸锭组织,复合添加0.20%Cr+0.20%Mn+0.03%Ti能够显著细化铸锭组织,其细化机理为含有Cr、Mn的原子团簇作为Al3Ti形核的基底促使α-Al成核;复合添加微量0.04%Cr+0.04%Mn+0.03%Ti+0.18%Zr产生了极强烈的晶粒细化效果,其细化机理为含有Cr、Mn的原子团簇作为Al3Ti、Al3Zr共同形核的基底使Al3(TixZr1-x)形核,Al3(TixZr1-x)使α-Al形核.随着Cr、Mn含量增加,铸锭晶粒向枝晶化、粗大化方向发展.
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