采用温度数据采集系统采集得到盐浴炉等温保温过程中试样的温度变化曲线,通过硬度和电导率测试测定7050铝合金的时间-温度-性能(TTP)曲线.采用透射电镜和热分析仪对7050铝合金进行显微组织观察和分析.结果表明:合金TTP曲线鼻温大约在320℃,孕育期约为1.7 s.合金的淬火敏感温度区间为230～410℃,且在此温度区间内,合金硬度随时间的延长而迅速下降.等温保温过程中,合金晶内淬火平衡η相主要依附于晶内Al3Zr等弥散相和细小Al2Cu相形核长大;且随着保温时间延长,淬火析出相的体积分数逐渐增加,晶界析出相趋向于连续分布,无析出带逐渐宽化.等温保温合金经时效后,晶内析出GPⅡ区及η'相数量随着等温保温时间的延长逐渐减少,使得合金性能降低,合金表现出一定淬火敏感性.
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