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在室温,采用通道夹角为120°的变形模具对工业纯钛(Commercial Pure Titanium,CP-Ti)以Bc方式实施四道次ECAP(Equal Channel Angular Pressing)挤压变形,成功获得表面光滑无裂纹的变形试样。文中主要研究了工业纯钛在室温下进行ECAP多道次变形的组织结构演变,并测试了变形试样的力学性能。微观结构显示工业纯钛在室温下进行多道次ECAP变形时,只在前两道次产生了大量的变形孪晶,且随道次增加变形孪晶逐渐消失。最终获得的试样晶粒平均尺寸由最初的约28μm细化到约250nm,试样断裂强度和显微硬度分别提高到773和2486MPa,而试样仍保持较好的延伸率(可达16.8%)。
At room temperature, four times of ECAP (Equal Channel Angular Pressing) extrusion deformation was performed on Commercial Pure Titanium (CP-Ti) in a Bc mode by using a deformation mold with an included angle of 120 ° to obtain a smooth and crack-free surface Of the deformation of the sample. In this paper, the evolution of the microstructure of commercial pure titanium subjected to ECAP multi-pass deformation was studied and the mechanical properties of deformed samples were tested. The microstructure shows that when industrial pure titanium undergoes multi-pass ECAP deformation at room temperature, a large amount of deformation twins are generated only in the first two passes, and the deformation twin disappears gradually with the increase of pass number. The average grain size of the sample finally obtained was refined from about 28μm to about 250nm, the breaking strength and microhardness of the sample were increased to 773 and 2486MPa, respectively, and the sample maintained good elongation (up to 16.8% ).