Abstract
The properties of the interface between titanium alloys and the rutile TiO₂ are crucial for improving oxidation resistance of titanium alloys. In this work, a first-principles method is used to predict the adhesion strength of the doped Ti/TiO₂ interface. The stability of the Ti/TiO₂ interface is enhanced by element Cr whereas reduced by element V. We also investigated the alloying elements segregation behavior near the Ti/TiO₂ interface. It is found that some elements, like V and Cr, tend to stay on the metal side of the interface. Hence, the oxidation resistance of titanium alloys has been increased by these alloying elements. This work not only helps us have a better understanding of the alloying atoms distribution in the Ti/TiO₂ interface but also find some clues of increasing the stability and oxidation resistance of titanium alloys.

Key words
first-principles, Ti/TiO₂ interface, alloying effects, oxidation resistance

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