用SEM和TEM对金属型铸造并经18个月自然时效的Z A27合金的微观组织进行了观察. 结果表明: ZA27合金凝固的初生相为富Al的树枝状α′相, 随后在α′相周围形成一层富 Zn的包晶β相 , 最后剩余液体发生共晶反应, 共晶β优先依附于包晶β相形核、长大, 而共晶η则在包晶β相间形成一层薄膜, 在有些区域则形成棒状共晶组织; 在随后的冷却及时效过程中 , β发生胞状分解形成规则的共析α+η层片组织或不规则的复杂形状组织, 共析胞以共晶η相为基形核, 并向枝晶中心生长, 使α′相也分解为层片α+η组织, 当其生长被α′中心的连续分解所阻挡时, 致使其芯部形成细小的α+η颗粒组织; 富Cu的ε相存在于所有η相中.
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