研究Al-CU-Mg-Ag-Zr合金在165℃时效组织与性能的变化,并采用欠时效(165℃×2 h)的试样进行200℃及外加应力为200 MPa的高温持久试验.结果表明,欠时效态的试样在高温持久下,随时间延长.其剩余强度先上升后下降,强度峰值出现在持久20 h.延伸率变化与强度变化基本相似.持久100 h后,合金力学性能相对欠时效态无明显下降,显示出优良的热稳定性.
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