挤压速度对工业纯钛室温ECAP变形孪晶的影响

摘要

在室温采用通道夹角为Φ=120°的模具,以不同挤压速度实现工业纯钛的单道次等径弯曲通道变形（ECAP）,利用光学显微镜（OM）观察了变形前后的组织形貌特征,分析了不同挤压速度对显微组织的影响。结果表明：在单道次ECAP变形过程中,孪晶变形是主要的变形机制,且随着变形速率（即挤压速度）的增大,孪晶变细,孪晶的密度显著增大。%A single pass（Φ=120°） equal channel angular pressing（ECAP） at room temperature was successfully carried out on commercially pure（CP） Ti with a wide range of extrusion speed.The microstructures of the as-received and ECAPed samples were analyzed by using optical microscopy（OM）.The experimental results show that twinning is an important deformation mechanism through the single pass,and increases with increasing extrusion speed.