In this study, Ti-5Al-5Mo-5V-1Cr-1Fe was implanted with Nb at 45 kV with dosages ranging from 1.0 × 1016 ions/cm2 to 1.0 × 1017 ions/cm2 in order to investigate their influence on the wear resistance and fatigue performance. The microstructure and elemental depth profiles were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The roughness and mechanical behavior were studied using the optical 3D Infinite Focus and dynamic ultra-microhardness tester respectively. Experimental results indicated that the wear resistance against a GCr15 ball was improved after Nb implantation. Particularly, the specific wear rate of the implanted samples with a dosage of 5.0 × 1016 ions/cm2 was lowest (0.2 mm3·N−1·m−1), nearly 10% of the substrate. However, the theoretical fatigue limit of the substrate decreased after Nb implantation. The mechanisms on how wear and high-cycle fatigue properties were affected by Nb implantation with different dosages were discussed in detail.

Fatigue, Hardness, Ion implantation, Titanium alloys, Wear
Surface and Coatings Technology
Department of Mechanical and Aerospace Engineering

Chen, X. (Xiaohu), Zhang, P. (Pingze), Wei, D. (Dongbo), Huang, X, Adriana, S. (Soveja), Michel, C. (Chaussumier), … Li, F. (Fengkun). (2019). Structures and properties of Ti-5Al-5Mo-5V-1Cr-1Fe after Nb implantation. Surface and Coatings Technology, 358, 676–687. doi:10.1016/j.surfcoat.2018.11.093