采用透射电镜和背散射电子衍射(EBSD)分析,观测了高纯铝在等通道转角变形加工(ECAP)中,三种应变速度对高纯铝显微组织的作用.结果表明:高速应变(100mm/s)以进一步提高纯铝的硬度,使晶粒达到0.31靘;大角晶界的百分数增大,最高可达89%.对目前ECAP研究中出现的两个问题,进行了分析讨论.最后指出:强塑性形变后获得的具有大角晶界的超细等轴晶粒不是再结晶组织.因为它们的晶界位错密度很高,处在高能状态;这种组织是通过动态回复,而不是动态再结晶产生的.
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