中文摘要：

室温下,分别采用90°模具和120°模具对工业纯钛（CP-Ti）进行一道次等径弯曲通道变形（Equal ChannelAngular Pressing,简称ECAP）,研究了其组织和硬度的变化情况。结果表明,工业纯钛经一道次ECAP变形后都形成板条状组织,硬度显著提高。90°模具挤压后试样上、下表面的硬度值稍低于试样中间的硬度值,而120°模具挤压后试样表面硬度分布较均匀。

英文摘要：

A single equal channel angular pressing（ECAP） at room temperature was successfully carried out in commercial pure Ti（CP-Ti） at the internal angle of 90° and 120° respectively,the microstructure and hardness of CP-Ti were studied.The results show that,after a single ECAP,elongated band structure is formed and hardness significantly enhances.By the 90° die,the micro-hardness is more in the centre and less near the top and the bottom edges.The contrast hardness is formed on the surface of the sample when the die angle is 120°.