Research Data Leeds Repository

Citation

Oladokun, Abimbola (2016) Fretting of CoCrMo and Ti6Al4V Alloys in Modular Prostheses. University of Leeds. [Dataset] https://doi.org/10.5518/31

This item is part of the 'In vitro Simulation and Biological Assessment of Wear in Silicon Nitride Coatings' subcollection, within the Life Long Joints collection.

Dataset description

Cobalt and Titanium based alloys are two most commonly used alloys in Total Hip Arthroplasty. The Cobalt alloy (Co28Cr6M) is commonly used as the head component of the Hip device whilst the Titanium alloy (Ti6Al4V) is used as the stem component. This paper assessed the failure mechanisms of both alloys under fretting conditions. The fretting contact was modelled using a ball-on-plate configuration at a contact pressure of 1 GPa serum containing solution. It was observed that the CoCr-CoCr fretting contact encouraged a gross slip fretting regime from as low as 25µm of displacement amplitude whereas, for the CoCr-Ti fretting contact at 25µm, a stick regime was observed. This indicated that CoCr-CoCr fretting contact degrades through a wear dominated mechanism whilst CoCr-Ti degrades through a fatigue dominated mechanism. The slip at the contact was shown to effect the removing of the protect oxide layer of both passive alloys.