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在一般冷却条件下，ＺＡ２７合金结晶后的组织中存在着三元共晶（β＋η＋ε）；稀土铈改善ＺＡ２７合金塑性的主要原因是铈增加了合金的成分过冷。
Under normal cooling condition, the ternary eutectic (β + η + ε) exists in the microstructure of the ZA27 alloy. The main reason that rare earth cerium improves the plasticity of ZA27 alloy is that cerium increases the undercooling of the alloy.