系统研究Al?5％Cu(AC)和Al?5％Cu?0.2％Mn?0.2Zr％(ACMZ)合金在温度为573～673 K的高温热稳定性和力学性能.结果表明,微合金化添加Zr和Mn元素对573 K主要强化相θ′相的稳定起到至关重要的作用.同时,高温拉伸结果表明,573 K热暴露200 h后,ACMZ合金强度为(88.6±8.8)MPa,远高于相同状态下AC合金的强度((32.5±0.8)MPa).最后,讨论高温状态下ACMZ合金的强度和塑性强化机制.“,”The high temperature (HT) thermal stability and mechanical properties of Al?5％Cu (AC) and Al?5％Cu? 0.2％Mn?0.2Zr％ (ACMZ) alloys from 573 to 673 K were systematically studied. The results displayed that micro-alloying additions of Zr and Mn elements have presented a significant role in stabilizing the main strengthening metastable θ′ precipitates at a temperature as high as 573 K. Simultaneously, the HT tensile test demonstrated that ACMZ alloy retained their strength of (88.6±8.8) MPa, which was much higher than that of AC alloy ((32.5±0.8) MPa) after the thermal exposure at 573 K for 200 h. Finally, the underlying mechanisms of strength and ductility enhancement mechanism of the ACMZ alloy at HT were discussed in detail.