超高纯铝的大塑性变形及再结晶行为

Large plastic deformation and recrystallization behaviors of ultra-high purity aluminum

为了探究超高纯铝的大塑性变形及其再结晶行为规律,采用两步法和三步法进行轧制实验,对比两种方式下超高纯铝组织变形行为,分别观察260、280、300、320℃热处理再结晶行为,确定超高纯铝靶材坯料最佳的热处理制度。实验结果表明,三步轧制工艺使高纯铝的组织更均匀;超高纯铝对热处理温度非常敏感,当热处理工艺制度为280℃×2 h时,可获得平均晶粒在100μm以下的超高纯铝靶材坯料;其再结晶形核过程受亚晶合并形核机制和晶界弓出机制共同控制。

In order to explore the large plastic deformation and recrystallization behaviors of ultra-high pure aluminum,the two-step and three-step methods were used to conduct rolling tests and compare the microstruc-ture deformation behaviors.The recrystallization behaviors were observed during heat treatments at 260,280,300,and 320℃to determine the best heat treatment for ultra-high purity aluminum target billet.The three step rolling process made the microstructure of the high purity aluminum more uniform.The ultra-high purity aluminum was very sensitive to heat treatment temperature.When the heat treatment process was at 280℃for 2 h,the ultra-high pure aluminum billet had an average grain size of below 100μm.The recrystallization nu-cleation process is controlled by the sub-grain merging mechanism and crystal boundary bowing mechanism.