利用分级淬火的方法测定了1933铝合金锻件硬度及电导率的时间-温度-性能(time-temperature-property,TTP)曲线.结果表明,TTP曲线呈"C"形,淬火敏感区间为265～355℃(200 s内硬度值下降10%),TTP曲线的"鼻尖"温度大约在310℃,在此温度下,硬度下降10%的临界时间为100 s.微观组织观察表明,在敏感区问内,平衡相η在晶界及Al3Zr与基体的界面上优先形核析出,并快速长大,导致合金过饱和度的下降,降低了时效强化的效果.与目前公布的其他Al-Zn-Mg-Cu系合金的TTP曲线对比,1933铝合金的"鼻尖"温度低,临界时间长,淬火敏感区间窄,因此淬火敏感性较低.
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