Forthcoming Articles

International Journal of Surface Science and Engineering

International Journal of Surface Science and Engineering (IJSurfSE)

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International Journal of Surface Science and Engineering (One paper in press)

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  • Effect of nitrogen ion implantation dose on microstructure and mechanical properties of TiNiCu alloy for orthodontic applications   Order a copy of this article
    by Bohang Zhu, Jiaze Wang, Tianyi Zhao, Hongbo Liu, Dan Chen, Huimin Zhou 
    Abstract: To improve the clinical performance of TiNiCu orthodontic archwires, friction must be reduced without compromising superelasticity, thereby ensuring sustained force delivery. In this study, nitrogen ion implantation was employed to modify the alloy surface. The influence of implantation dose on its microstructure, tribological behaviour and superelastic stability was systematically investigated. Results showed that a nitride-rich modified layer formed near the surface, with the phase evolving from Ti2N to TiN as the dose increased. At 1.0-1.5 x 1018 ions/cm2 (10-15 h), the friction coefficient decreased by approximately 90% and the wear rate by 65.3%. The austenite finish temperature (Af) remained between 32 and 35 C, which is below the oral temperature, indicating a fully austenitic state during clinical use. This modification enhanced wear resistance and superelastic cyclic stability, thereby providing experimental guidance for developing low-friction TiNiCu orthodontic archwires.
    Keywords: TiNiCu alloy; nitrogen ion implantation; wear resistance; friction coefficient; cyclic stability; surface modification.
    DOI: 10.1504/IJSURFSE.2026.10080272