【摘要】 本文研究了Sc添加量对Al9.0Zn2.5Mg2.2Cu0.2Zr合金铸态组织的影响。结果表明，微量Sc与Zr协同可形成Al₃（Sc, Zr）第二相，在铸造过程中具有促进非均质形核、细化铸态晶粒的作用，并对合金共晶组织有明显的变质作用。但铸态合金中部分可达微米级初生Al₃（Sc, Zr）第二相对合金的加工性能和力学性能易产生不良影响。更多还原

【Abstract】 The research was conducted on the effect of Sc addition on the as-cast organization of Al9.0Zn2.5Mg2.2Cu0.2Zr aluminum alloy. The results show that the second phase of Al₃（Sc, Zr）, which can be formed by the synergy of trace Sc and Zr, has the functions of promoting non-homogeneous nucleation and refining the as-cast grains during casting process, and it has an obvious metamorphic effect on the eutectic microstructure of the alloy. However, some primary Al₃（Sc, Zr） second phases in cast alloys that can reach the micrometer level may adversely affect the machinability and mechanical properties of the alloys.更多还原