铸态锌铜合金的光学显微结构表明，铜元素含量的提高对晶粒细化有一定的作用。当铜元素含量低于1%时，在铸态组织中并未发现明显的第二相。在Zn-2Cu中观察到了明显的凝固组织，即初生Zn基体和枝晶第二相。

The optical microstructure of the as-cast zinc-copper alloy shows that the increase of the copper content has a certain effect on the grain refinement. When the copper content is less than 1%, no obvious second phase is found in the as-cast structure. Obvious solidification structure was observed in Zn-2Cu, namely primary Zn matrix and secondary dendrite phase.