【摘要】 通过拉伸测试与电子显微分析方法研究了高温热暴露处理对2055-T83态铝锂合金的显微组织与力学性能的影响。结果表明，2055-T83态合金在150℃下热暴露时，强度降低较少，主要原因是T₁相具有良好的热稳定性和较强的抗粗化能力。当热暴露温度为300和350℃时，合金强度迅速下降，伸长率大大增加，此时合金中的主要强化相T₁相发生粗化及部分溶解，同时合金中还出现了Ω-Al₂Cu相和Al₃Zr颗粒。更多还原

【Abstract】 The effects of heat exposure on the microstructure and mechanical properties of 2055-T83 Al-Li alloys were investigated by electron microscopy analysis and mechanical property tests. The results indicate that the strength of 2055-T83 alloy has little decrease after heat exposure treatment at 150 ℃, which is attributed to the desirable thermal stability and strong anti-coarsening ability of T₁ phase. When the heat exposure temperature is 300 ℃ or 350 ℃, the strength of the alloys is decreased rapidly and the elongation is increased significantly, where the main strengthening T₁ phase is coarsened and partial dissolved, and Ω-Al₂Cu phase as well as Al₃Zr particles also appear.更多还原