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Materials 2016, 9(2), 111; doi:10.3390/ma9020111

An Investigation on the Wear Resistance and Fatigue Behaviour of Ti-6Al-4V Notched Members Coated with Hydroxyapatite Coatings

1
Medical Device Research Institute, School of Computer Science, Engineering and Mathematics, Flinders University, Tonsley 5042, Australia
2
Discipline of Mechanical Engineering, School of Computer Science, Engineering and Mathematics, Flinders University, Tonsley 5042, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Richard Thackray
Received: 8 December 2015 / Revised: 27 January 2016 / Accepted: 2 February 2016 / Published: 16 February 2016
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Abstract

In this study, surface properties of Ti-6Al-4V alloy coated with hydroxyapatite coatings were investigated. Wear resistance and fatigue behaviour of samples with coating thicknesses of 10 and 50 µm as well as uncoated samples were examined. Wear experiments demonstrated that the friction factor of the uncoated titanium decreased from 0.31 to 0.06, through a fluctuating trend, after 50 cycles of wear tests. However, the friction factor of both the coated samples (10 and 50 µm) gradually decreased from 0.20 to 0.12 after 50 cycles. At the end of the 50th cycle, the penetration depth of the 10 and 50 µm coated samples were 7.69 and 6.06 µm, respectively. Fatigue tests showed that hydroxyapatite coatings could improve fatigue life of a notched Ti-6Al-4V member in both low and high cycle fatigue zones. It was understood, from fractography of the fracture surfaces, that the fatigue zone of the uncoated specimens was generally smaller in comparison with that of the coated specimens. No significant difference was observed between the fatigue life of coated specimens with 10 and 50 µm thicknesses. View Full-Text
Keywords: titanium alloys; hydroxyapatite coatings; wear; fatigue titanium alloys; hydroxyapatite coatings; wear; fatigue
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Oskouei, R.H.; Fallahnezhad, K.; Kuppusami, S. An Investigation on the Wear Resistance and Fatigue Behaviour of Ti-6Al-4V Notched Members Coated with Hydroxyapatite Coatings. Materials 2016, 9, 111.

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