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中文摘要：
研究Al-5．7Cu-0．4Mg-1．2Ag合金在不同时效温度下的性能和显微组织，以及峰时效态合金在200℃长时间热暴露后的力学性能和显微组织，并分析Q相的长大机制。结果表明：合金在165℃时效具有较好的热稳定性，峰时效态（165℃，14h）合金在200℃热暴露1000h后仍能保留73．4％的强度。热暴露过程中，较短的Q相不断溶解，较长的Q相不断增长，导致Q相平均长度逐渐增加，密度逐渐降低。
英文摘要：
The mechanical properties and microstructures of A1-5.7Cu-0.4Mg-I.2Ag alloy prepared and aginged at different temperatures, respectively, as well as the mechanical properties and microstructures of the peak-aged alloy after long thermal exposure at 200 ℃ were studied. The growth mechanism of Ω phase was also investigated. The results show that the alloy exhibits high thermal stability at 165℃, and the peak-aged （165 ℃/14 h） alloy still remains 73.4% of the tensile strength after exposure at 200℃ for 1 000 h. During thermal exposure, the lengthening of Ω phase involved the diffusion of the shorter Ω precipitates and the growth of the longer ones result in the increase of the average Ω length and the decrease of the density.
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