ZnAl10Cu2合金在热压缩条件下绝热剪切带的形成及其特征

Formation and Feature of Adiabatic Shear Bands of ZnAl10Cu2 Alloy Under Hot Compression Condition

采用Gleeble-1500D热模拟试验机研究了ZnAl10Cu2合金热变形行为,使用光学显微镜(OM)、扫描电镜(SEM)分析了压缩后合金试样的显微组织。结果表明,绝热剪切带的宽带随应变速率的增加而减小,位于剪切带中心区域的初生枝晶沿其扩展方向被剧烈拉长成纤维状,且表现出塑性流动局域失稳的特征。基体β相发生动态再结晶,形成细小的等轴晶粒。

The hot deformation of ZnAl10Cu2 alloy during compressing at elevated temperature was investigated by compression on Gleeble-1500D dynamic materials test machine.The microstructure of the alloy samples after compressing was analyzed by optical microscopy（OM）,scanning electron microscopy（SEM）.The results show that the broadband of adiabatic shear band increases with decreasing the strain rate.The central region of the shear zone is composed of distorted primary phase along the propagation direction,which show the instability characteristics of the plastic flow localization.The dynamic recrystallization occurs in β phase matrix.The fine equiaxed grains were formed.