Tribological Behaviour of Orthopaedic Ti-13Nb-13Zr and Ti-6Al-4V Alloys |
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Authors: | I Cvijovi?-Alagi? Z Cvijovi? S Mitrovi? M Rakin ? Veljovi? M Babi? |
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Affiliation: | (1) Institute of Nuclear Sciences „Vinča”, P.O. Box 522, 11001 Belgrade, Serbia;(2) Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11120 Belgrade, Serbia;(3) Faculty of Mechanical Engineering, University of Kragujevac, Sestre Janjić 6, 34000 Kragujevac, Serbia |
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Abstract: | The aim of this study is to compare the tribological behaviour of novel orthopaedic implant alloy Ti-13Nb-13Zr with that of
the standard Ti-6Al-4V ELI alloy, available in four different microstructural conditions produced by variations in the heat
treatments. The friction and wear tests were performed by using a block-on-disc tribometer in Ringer’s solution at ambient
temperature with a normal load of 20–60 N and sliding speed of 0.26–1.0 m/s. It was found that variations in microstructures
produced significant variations in the wear resistance of Ti-6Al-4V ELI alloy. The wear losses of materials solution treated
(ST) above the β transus temperature are significantly lower compared with those of materials ST in the (α + β) phase field
and are almost insensitive to applied load and sliding speed. Wear loss of the (α + β) ST Ti-6Al-4V ELI alloy continuously
increased as applied load was increased and was highest at the highest sliding speed. The Ti-6Al-4V ELI alloy in all microstructural
conditions possesses a much better wear resistance than cold-rolled Ti-13Nb-13Zr alloy. Friction results and morphology of
worn surfaces showed that the observed behaviour is attributed to the predominant wear damage mechanism. |
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