文章编号：(1998)02-254-5
过饱和ZA27的尺寸收缩及其与组织转变的关系
(四川联合大学金属材料系, 成都 610065)
摘 要: 研究了过饱和ZA27的尺寸变化规律及其与组织转变的关系。过饱和ZA27在80 ℃时效过程中发生迅速而明显的尺寸收缩现象, 其收缩率高达0.30%左右，随后尺寸变化很小。 铜加剧尺寸收缩。 η相(锌相)和ε相(CuZn4)从过饱和固溶体中迅速脱溶是造成尺寸收缩的原因。
关键字: 锌基合金 尺寸稳定性 相转变
DIMENSIONAL SHRINKAGE OF SUPERSATURATED ZA27 AND INFLUENCE OF PHASE TRANSFORMATION
（Department of Metallic Materials, Sichuan Union University, Chengdu 610065, P . R. China）
Abstract:It was found that the dimensions of supersaturated ZA27 reduced quickly and obviously during ageing at 80 ℃, and copper enhanced the shrinkage phenomenon. The dimensional shrinkage which occurred during ageing was due to the quick decomposition of η(Zn phases) and ε(CuZn4 phases) from supersaturated solid solution.
Key words: Zn base alloys dimensional stability phase tran sformation
