变形温度对AZ80镁合金微观组织演化的影响

Effect of deformation temperature on microstructure evolution of AZ80 alloy

研究了变形温度对AZ80镁合金微观组织演化的影响,利用电子背散射衍射(EBSD)技术观察分析了不同变形温度变形后的AZ80镁合金微观组织.结果表明:与400℃变形温度相对比,350℃时平均晶粒尺寸减小,平均晶粒形状纵横比减小,更有利于提高材料的塑性和强度.变形温度350℃时,小角度晶界增多,导致再结晶分数减小;几何必须位错密度增大,促使流变应力峰值增大;Schmid因子硬取向分数增加,促进基面织构得到强化.变形温度为400℃时主要为{1120}<1010>,{1010<2110>}柱面织构,变形温度为350℃时主要为{0001}<1010>基面织构.

The microstructure evolution of AZ80 magnesium alloy under different deformation temperature was studied,and the microstructure of AZ80 magnesium alloy under different deformation temperature was observed by using electron backscattered diffraction.The results showed that compared with the deformation temperature of 400℃,both the average grain size and the aspect ratio of average grain shape decreased at 350℃,which was more conducive to improving the plasticity and strength of the material.When the deformation temperature was 350℃,the low-angle grain boundaries increased,leading to a decrease in the recrystallization fraction;the geometrical necessary dislocation density increased,promoting the increase of the peak flow stress;the hard orientation fraction of the Schmid factor increased,which promotes the strengthening of the basal texture.When the deformation temperature was 400℃,it was mainly{1120}<1010>and{1010<2110>}prismatic texture;while the deformation temperature was 350℃,it was mainly{0001}<1010>basal texture.