利用高温短时拉伸试验、扫描电镜和透射电镜等分析手段,研究了经165℃×2 h时效处理的Al-Cu-Mg-Ag合金在不同温度下的显微组织和力学性能.结果表明:随着温度的升高,强度逐渐下降,而伸长率先降后升.在200℃时合金具有最低的伸长率(12%),在温度高于200℃时,合金强度下降较快.当温度升至350℃时,抗拉强度、屈服强度分别降至105 MPa、98 MPa,伸长率增至23%.在高温条件下,该合金力学性能的下降主要是由于析出相的粗化与转变引起的.
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