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.

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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