| DUAN Bing-bing,WANG Zhi-guo,CAI Jin,LI Wei,SI Chao-run.Research Progress on Surface Nanocrystallization Strengthening of Titanium Alloys[J],50(12):202-216, 245 |
| Research Progress on Surface Nanocrystallization Strengthening of Titanium Alloys |
| Received:November 27, 2020 Revised:March 25, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.12.021 |
| KeyWord:surface nanocrystallization titanium alloy nanocrystallization mechanism microstructure surface properties |
| Author | Institution |
| DUAN Bing-bing |
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an , China |
| WANG Zhi-guo |
AVIC Xi’an Aircraft Industry Group Company Ltd., Xi’an , China |
| CAI Jin |
College of Aerospace Engineering, Shenyang Aerospace University, Shenyang , China |
| LI Wei |
College of Aerospace Engineering, Shenyang Aerospace University, Shenyang , China |
| SI Chao-run |
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an , China |
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| Abstract: |
| Titanium and titanium alloys have been widely used in aerospace field because of their low density, high specific strength and good corrosion resistance. Surface nanocrystallization is to form a strengthening layer composed of nano-sized particles or grains on the surface of materials by certain technical means, so as to improve the surface properties of metal materials. Because of its unique advantages of good universality and simple process, it has become a research hotspot in the field of surface strengthening in recent years. Severe plastic deformation occurs on the surface of titanium and titanium alloy after self-nanocrystallization treatment, resulting in the formation of a unique gradient nanostructure layer in the material, which are sharply deformed layer, submicron fine grain layer, coarse grain deformation layer and matrix layer, respectively. the change of surface structure will also lead to changes in the surface properties of titanium alloy. In this paper, three surface nanocrystallization methods of surface coating or deposition, surface self-nanocrystallization and mixed nanocrystallization are briefly summarized, and their advantages and disadvantages and existing problems are analyzed. secondly, the key role of twins and dislocations in the self-nanocrystallization process of titanium alloys is discussed, and the differences of nanocrystallization mechanisms of α, α+β and β titanium alloys are discussed. The research status of surface nanocrystallization mechanism of titanium alloy is summarized. On this basis, the effects of surface nanocrystallization on the surface properties of titanium alloys are introduced, including the effects of hardness and residual stress, fatigue, corrosion, wear and diffusion properties in recent years, and the strengthening mechanism is analyzed. Finally, the shortcomings of the existing research on surface nanocrystallization of titanium alloys are summarized, and the future research work is prospected. It is also proposed that the surface nanocrystallization technology should be combined with digital simulation technology and nitriding technology to develop digital and composite strengthening technology, so as to provide valuable reference for the development and research of surface nanocrystallization technology in the field of titanium alloy. |
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