采用透射电子显微镜(TEM)、选区电子衍射(SADP)和硬度测试等手段研究1973高强高韧铝合金在不同温度下的单级时效析出及硬化行为.结果表明:1973铝合金在120和140℃有很强的抗过时效能力,峰时效过后,硬度在长时间内基本保持在195 HV附近.1973铝合金的析出序列为:α过饱和固溶体(SSS)→GP I区/GPⅡ区→η'亚稳相→η平衡相→T相.在140℃单级时效过程中,GPⅡ区和η'相一直都存在于时效合金中,对合金起着最大的强化作用.
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