2195铝锂合金在工业生产中应用广泛,不同的初始热处理状态影响其热变形行为.因此,本文旨在研究热处理状态对2195铝锂合金的组织演变和热变形行为的影响.实验在Gleeble-3800热模拟机上进行,温度范围为350~500℃,应变速率为0.01~10 s-1.将热变形后各区域的微观组织进行对比,并计算出合金的本构模型和加工图.在较高的变形温度(400~500℃)下,T3和T8试样的峰值应力基本相同,同时发现热变形后合金中存在低角度晶界(LABs)和动态再结晶.由于固溶强化和形变强化作用,2195-T8铝锂合金表现出比2195-T3铝锂合金更大的形变激活能.本文确定2195-T3和2195-T8铝锂合金的最佳热加工条件均为475~500℃和0.01~0.1 s-1.本文可为铝锂合金在后续热加工过程中设置热处理参数提供有益的帮助.
2195 aluminum-lithium alloy has numerous applications in industrial production,and the different initial heat treatment state impacts its hot deformation behavior.Therefore,this work seeks to examine the impact of heat treatment states on the microstructure development and deformation behavior of 2195 Al-Li alloys.The experiments have been carried out on a Gleeble-3800 thermo-mechanical simulator in the temperature range 350-500℃and with a strain rate of 0.01-10 s-1.The microstructure analysis in various regions was compared,and constitutive models and processing maps of the alloys were produced.At high deformation temperatures(400-500℃),the peak stress of the T3 and T8 samples is nearly the same.Low angle boundaries(LABs)and the content of dynamic recrystallization have also been found.Due to solution strengthening and deformation strengthening effects,the 2195-T8 Al-Li alloy plate exhibited a larger deformation activation energy than the 2195-T3 Al-Li alloy.The hot working windows of the Al-Li alloys 2195-T3 and 2195-T8 were determined to be 475-500℃and 0.01-0.1 s-1,respectively.The research can serve as useful assistance for the Al-Li alloy's ideal heat treatment conditions during hot working processing.