采用透射电镜观察、硬度和电导率测试等手段研究双级时效对1973高强高韧铝合金组织和性能的影响.结果表明:一级时效温度对合金最终组织和性能的影响不大,二级时效温度和时间对1973铝合金硬度和电导率的影响明显;1973铝合金适宜的双级时效工艺为(120℃,6 h)+(160℃,16 h),在此条件下,合金的硬度和电导率分别为191HV和38.0%(IACS),其显微组织特点为晶内沉淀相呈细小弥散状分布,而合金的晶界沉淀相粗大、呈断续状分布,并且有较明显的无沉淀析出带.合金中主要沉淀相为η'相和η相,此外还有少量的GPⅡ区.
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