中文摘要：

采用光学显微镜、透射电子显微镜对工业纯钛室温等径角挤压（ECAP）后的显微组织进行了分析,探讨了滑移、孪生和晶粒转动三种变形机制在其室温塑性变形过程中的作用。结果表明：工业纯钛在室温ECAP变形时,变形机制以滑移和孪生为主;晶粒转动机制发挥了协调大尺寸晶粒的变形并有利于提高工业纯钛变形能力的重要作用;同时动态再结晶也是材料塑性变形的重要协调机制。

英文摘要：

The microstructure of commercial pure titanium processed by equal channel angular pressing （ECAP） at room temperature was studied by using optial microscopy and TEM.The functions of three deformation mechanisms including slipping,twinning and grain turning during the plastic deformation at room temperature were discussed.The results show that sliding and twinning were the main deformation mechanisms of the commercial pure Ti during ECAP deformation at room temperature.And grain turning was another important mechanism to coordinated the large grain deformation and improve the ductility of commercial pure titanium.Dynamic recrystallization was the important coordination mechanism in plastic deformation.