Title: Mechanical analysis and high temperature wear behaviour of AlCrN/DLC coated titanium alloy

Authors: K. Gangatharan; N. Selvakumar; P. Narayanasamy; G. Bhavesh

Addresses: Department of Mechanical Engineering, Mepco Schlenk Engineering College, Virudhunagar 626005, Tamil Nadu, India ' Department of Mechanical Engineering, Mepco Schlenk Engineering College, Virudhunagar 626005, Tamil Nadu, India ' Department of Mechanical Engineering, Kamaraj College of Engineering and Technology, Virudhunagar, Tamil Nadu, India ' Department of Production Technology, Madras Institute of Technology, Tamil Nadu, India

Abstract: The present investigation focused on the mechanical and the tribological behaviour of PVD coated Ti-6Al-4V for elevated temperature applications. The effects of AlCrN and DLC coatings on the surface of the titanium alloys produced by arc evaporation method were studied. Nano indentation, tensile and high temperature wear tests were carried out to evaluate the hardness, strength and tribological properties of coated Ti-6Al-4V. The DLC coating on the titanium alloy exhibits a higher hardness value of 1,125 HV. The results of tensile test made clear that both AlCrN and DLC coatings can improve the plasticity of uncoated Ti-6Al-4V alloy. High temperature sliding wear characteristics of AlCrN and DLC coatings was studied under lubricated condition for elevated temperature applications. The wear tests showed that the wear rates and friction coefficients of AlCrN and DLC coatings, both increases with the increasing temperature. The wear results were compared with those of uncoated Ti-6Al-4V titanium alloys, which exhibited a lower coefficient of friction (COF) due to the change of wear mechanism to slight abrasion wear from severe delamination. The superiority of the DLC coated Ti-6Al-4V was confirmed by the final results.

Keywords: wear behaviour; diamond-like carbon; DLC coatings; aluminium chromium nitride; AlCrN coatings; surface coatings; titanium alloys; arc evaporation; hardness; tensile strength; worn surfaces; mechanical properties; tribology; high temperature; nanoindentation; plasticity; sliding wear; wear rates; friction coefficients; abrasion wear; delamination.

DOI: 10.1504/IJSURFSE.2016.075315

International Journal of Surface Science and Engineering, 2016 Vol.10 No.1, pp.27 - 40

Received: 15 Jul 2014
Accepted: 20 Nov 2014

Published online: 11 Mar 2016 *

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