中文摘要：

利用等通道转角挤压（ECAP）对纯铝进行了连续的挤压,结合位错及断口形貌,分析了位错强化及断裂机制。结果表明,剪切变形使位错滑移,晶粒细化,挤压4道次后材料屈服强度、抗拉强度分别较初始态提高了38.5%和24.0%,断裂机制呈现典型的沿晶断裂特征。

英文摘要：

The pure Al was pressed continuously by equal channel angular pressing; the dislocation reinforcement and fracture mechanism are studied by micrographs of dislocation and tensile fracture surface of the pure AI. The TEM results show that the shear deformation makes dislocation slips and refines grain, and makes the yield strength and the ultimate tensile strength increase by 38.5% and 24.0% respectively after four passes by ECAP,Fracture mechanism presents typical intergranular fracture.