Abstract: With the development of economy and the aging of population, the demand for metal materials in trauma surgery, plastic surgery and dental medicine is increasing. Titanium and its alloys have been widely used in biomedical engineering due to their excellent corrosion resistance and good biocompatibility. The slow dissolution and accumulation of alloying elements of titanium alloys in human body can cause illness, so commercially pure titanium without alloying elements has attracted much attention in the field of biomedical materials. In recent decades, ultrafine grained(UFG) commercially pure titanium has been successfully prepared by equal channel angular pressing (ECAP). However, there are grain refinement and strengthening limits in the UFG materials prepared by ECAP. It is limited the application of UFG commercially pure titanium due to the low production efficiency of multi-passes ECAP, and the high requirement on the size and shape of the workpiece. In order to meet the high strength requirements of commercially pure titanium and develop processing technology which is easy to be applied in practice, ECAP combined with traditional plastic processing (complex deformation technology) has been extensively studied and applied. The strength of commercially pure titanium increases to about 1 000 MPa and the plasticity remains good after complex deformation (multi-passes of ECAP and followed by conventional plastic processing), which is due to grain refinement and the increase in the dislocation density. After post-deformation, the equiaxed grains after ECAP are elongated and unevenly distributed, which leads to the strong anisotropy of mechanical properties. The complex deformation can use less passes of ECAP, shorten the processing cycle, and transform the material into the desired finished shape, making it easier to use in production and application. The ductility of UFG commercially pure titanium after complex deformation can be improved by low-temperature annealing. In this paper, the research progresson the preparation of UFG commercially pure titanium by complex deformation is reviewed. It focuses on the microstructure, mechanical properties, thermal stability and texture evolution of commercially pure titanium after different complex deformation. The research status and existing problems in preparation of ultrafine grained commercially pure titanium by complex deformation technology and the further research direction are pointed out. It can provide reference for the development of high-efficiency and easy-to-process complex defor-mation technology.
刘晓燕, 张琪, 高飞龙, 杨西荣, 罗雷, 柳奎君. 复合变形制备超细晶工业纯钛的研究进展[J]. 材料导报, 2020, 34(19): 19111-19116.
LIU Xiaoyan, ZHANG Qi, GAO Feilong, YANG Xirong, LUO Lei, LIU Kuijun. Research Progress on Preparation of Ultrafine Grained Commercially Pure Titanium by Complex Deformation. Materials Reports, 2020, 34(19): 19111-19116.
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2020, Vol. 34 
