中文摘要：

对铸态及轧制态的纯铝进行了等径角挤压（ECAP）变形，用透射电镜观察了变形后的显微组织，并对不同道次变形后的材料进行了硬度测定。结果表明：ECAP方法可使纯铝组织获得显著细化，在相同的变形条件下，铸态与轧制态纯铝均获得了等轴细晶组织，且晶粒尺寸相差不大。1道次ECAP变形后材料的硬度明显增大，随后每道次硬度的增大趋势明显变缓。这说明初始状态时ECAP变形后的组织和性能影响不大．

英文摘要：

Cast and rolled Al were deformed by equal channel angular pressing （ECAP）. Microstructure before and after ECAP were observed and hardness of the materials were measured. The grains in the materials could be remarkably refined by ECAP and there is no obvious difference between the deformed microstructure of specimens which had different initial states. The Vickers hardness of the materials increased after 1st pass during ECAP process and the increasing trend become slower in the following passes. The initial states have no obvious impact on the microstructure and mechanical properties of the materials during ECAP process.