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中文摘要：
通过硬度测试、拉伸测试、透射电镜和扫描电镜等分析方法,研究冷变形及再时效对2519A-T87铝合金微观组织与性能的影响。研究结果表明：经过50%冷轧变形以及于100℃再时效3 h后,合金的抗拉强度为516 MPa,屈服强度为485 MPa,伸长率为6.5%,综合效果最佳。此时合金受冷变形与再时效的影响,合金内的θ′相开始向平衡相（θ相）转化,与T87相比,合金析出相的长宽比变小,体积分数增加,总体时效强化效果不明显。合金强度的提升主要依赖于加工硬化。
英文摘要：
The effects of cold deformation and reaging on the microstructures and mechanical properties of 2519A-T87 alloy plate were investigated by hardness test, tensile test, transmission electron microscopy（TEM） and scanning electron microcopy（SEM）. The results show that after 50% cold rolling reduction and reaging at 100 ℃ for 3 h, the tensile strength, yield strength and elongation of the alloy plate are 516 MPa, 485 MPa, 6.5%, respectively. Due to the effect of cold deformation and reaging, the alloy with θ′ phase transforms into equilibrium phase（θ）. Compared to T87, the aspect ratio of precipitates decreases, and its volume fraction increases. The overall aging strengthening of the alloy is not obvious, therefore, the enhancement of the strength is primarily dependent on work hardening.
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