通过金相和扫描电镜等分析手段,研究预变形和过时效对机械热处理细化AA2195铝锂合金晶粒的影响.结果表明:过时效前的预轧制变形所形成的应变区为第二相提供了均匀的形核位置,提高了第二相粒子的体积分数;与400℃单级过时效相比,预变形后采用300℃+400℃双级过时效可使第二相粒子间距由2.09μm增大到3.43μm,在轧制过程中有利于形成独立的高能应变区,为再结晶提供更多的形核位置,进一步细化、等轴化AA2195铝锂合金晶粒,最终晶粒尺寸由12.6 μm细化至8.8μm,晶粒纵横比由1.61减小至1.27.
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