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试验和基于原子尺度的理论计算表明，过饱和ZA27合金在80℃时效时发生迅速而明显的尺寸收缩，其后尺寸变化很小，重新加热到150℃时效时产生尺寸膨胀。η相和ε相从过饱和固溶体中脱溶和α＋ε→T’＋η四相反应分别是导致尺寸收缩和膨胀的原因。采用250℃／7h＋80℃／6h处理工艺，可基本消除ZA27合金的尺寸不稳定现象。
Experiments and theoretical calculations based on atomic scales show that the supersaturated ZA27 alloy rapidly and obviously shrinks in size at 80 ℃, and then changes its size very little. When reheated to 150 ℃, the size expansion occurs. η phase and ε phase from the supersaturated solid solution and α + ε → T ’+ η four-phase reaction were the cause of size contraction and expansion. Using 250 ℃ / 7h + 80 ℃ / 6h treatment process, the size of the alloy ZA27 can basically eliminate the phenomenon of instability.