采用ECAP技术和常规冷轧复合变形工艺制备了高强度工业纯钛,研究了复合变形后试样的力学性能与显微组织的关系. 结果表明,工业纯钛经室温单道次ECAP和冷轧复合变形后, 晶粒被严重拉长, 形成了明显的纤维状组织,试样的抗拉强度高达805 MPa; 随着冷轧变形量的增大, 变形组织的细化程度和均匀性提高,使试样的强度和塑性进一步提高. 位错滑移和孪生是工业纯钛室温ECAP和冷轧复合变形的主要变形机制.
Equal channel angular pressing and cold rolling (ECAP+ CR) were carried out in commercial pure (CP) Ti by combining ECAP and traditional deformation. Microstructure and mechanical properties of as-deformed Ti were studied. The results show that, after ECAP+CR, grains are significantly elongated and formed into fibrous tissue; for the CP Ti processed by ECAP and a higher rolling strain of 55%, its yield strength and ultimate strength reach to 715MPa and 805MPa, respectively, while maintaining good ductility of 16.8%, the mechanical properties are closed to that of Ti-6Al-4V.
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