微量稀土元素Er对高纯铝再结晶行为的影响

Effect of Trace Rare-earth Element Er on Recrystallization Behavior of High Pure Aluminum

采用硬度测试、金相显微观察和透射电镜分析等方法,研究了微量稀土Er对高纯铝再结晶行为的影响。结果表明:弥散分布的细小Al3Er质点对位错和亚晶界具有钉扎作用,可以有效抑制再结晶,将高纯铝的再结晶温度提高50℃左右,同时还能显著细化再结晶晶粒;再结晶形核机制是亚晶聚合和亚晶长大双重机制。

The influences of trace Er addition on the recrystallization behavior of high pure aluminum has been studied by hardness measurement, optical microscope and transmission electron microscope. The result shows that the recrystallization temperature of Er-doped aluminum increases about 50degreesC. The increase is caused by the pinning effect of highly dispersed fine Al3Er precipitates on dislocation and subgrain boundary. The recrystallizing process presents the nucleation mechanism not only of the subgrain coalescence but also of subgrain growth.