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通过光学显微镜、扫描电镜、硬度测试、电导率测试、差示扫描热量计(DSC)分析、能谱分析等方法研究了固溶处理对新型铝锂合金X2A66挤压板材显微组织和力学性能的影响。结果表明,在460~520℃和40~80 min范围内,随着固溶温度的升高和固溶时间的延长,合金中粗大的第二相粒子逐渐回溶进入合金基体中,固溶效果增强。但是,随着固溶温度的进一步提高或者固溶时间的进一步延长,合金晶粒将变得粗大甚至发生再结晶,合金的强度逐渐降低。在试验中获得X2A66合金最佳固溶处理工艺为520℃/80 min。
The effects of solution treatment on the microstructure and mechanical properties of the new aluminum-lithium alloy X2A66 extruded plate were studied by means of optical microscope, scanning electron microscope, hardness test, conductivity test, differential scanning calorimeter (DSC) and energy spectrum analysis influences. The results show that the coarse second phase particles gradually dissolve into the alloy matrix at 460-520 ℃ and 40-80 min with the increase of solution temperature and solution time, Enhanced. However, as the solution temperature is further increased or the solution time is further extended, the alloy grains become coarse and even recrystallized, and the strength of the alloy gradually decreases. X2A66 alloy obtained in the experiment the best solution treatment process is 520 ℃ / 80 min.