【摘要】 采用连续等通道装角挤压方法对工业纯钛进行了多道次加工，获得了超细晶工业纯钛。通过透射电子显微镜、显微硬度测试、室温拉伸性能测试等手段对工业纯钛进行了微观组织观察和力学性能研究。结果表明，随着加工道次的增加，晶粒逐步得到细化，经4道次加工后，晶粒尺寸约为500 nm。工业纯钛在加工过程中的塑性变形由孪晶与位错滑移共同协调。4道次加工后，工业纯钛的硬度和强度均获得了明显提升，硬度提升到253 HV,抗拉强度提高到627 MPa,并且仍保持了29%的较高延伸率。8道次加工后，试样由于中间保温造成了晶粒尺寸增加，硬度与强度和4道次相比有所下降。更多还原

【Abstract】 Ultrafine-grained pure Ti was obtained by multi-pass continuous equal channel angular pressing. The microstructure and mechanical properties of pure Ti were observed by transmission electron microscope, microhardness tests and room-temperature tensile tests. The results showed that the grains were gradually refined with the increase of processing passes. After 4 passes, the grain size was about 500 nm. The plastic deformation of pure Ti during processing was coordinated by twins and dislocation slip. After 4 passes, the hardness and strength of pure Ti were all increased, whose hardness was increased to 253 HV and tensile strength was improved to 627 MPa, with a high elongation of 29%. The hardness and strength of the 8-pass sample were decreased compared with that of the 4-pass sample, due to the increased grain size resulting from the intermediate annealing.更多还原