Oladokun, A, Hall, RM, Neville, A et al. (1 more author) (2019) The evolution of subsurface micro-structure and tribo-chemical processes in cocrmo-ti6al4v fretting-corrosion contacts: What lies at and below the surface? Wear, 440-44. ARTN: 2030. ISSN 0043-1648
Abstract
Titanium and its alloys are attractive biomaterials because of their desirable corrosion, mechanical, biocompatibility and osseointegration properties. Ti6Al4V alloy in particular remains a prominent biomaterial used in Total Hip Arthroplasty (THA). Recently, researchers have shown interest in understanding the degradation mechanisms and the subsurface implications of fretting-corrosion at the modular taper interface in THA. The purpose of this study was to utilise advanced microscopy and spectroscopy to characterise in-vitro fretting-corrosion induced subsurface refinement and microstructural changes in Ti6Al4V alloy. In-vitro fretting-corrosion tests were carried at four displacement: ±10, ±25, ±50 and ± 150 μm for a CoCrMo – Ti6Al4V ball-on-flat material couple. Subsequently, high resolution micrographs of the alloy microstructure were obtained using the Transmission Electron Microscope (TEM) together with Energy Dispersed X-Ray spectroscopy (EDX). The degree of subsurface microstructural changes was observed to be linked to the slip regime and magnitude of energy dissipated at the interface. Strain-induced orientation were observed at the stick regime. The mixed and gross-slip regimes were both characterised with mechanical mixing and formation of nano-crystalline structures. Specific to the mixed fretting regime, fluid ingression and material entrapment at the interface led to further refinement of nano-crystalline structures which resulted in the formation of an amorphous Ti6Al4V structure. The interwoven relationship between energy dissipation, contact condition and mechanisms of clinical failure in Ti6Al4V alloy are discussed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Elsevier B.V. This is an author produced version of a paper published in Wear. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Ti6Al4V; CoCrMo; Fretting regimes; Strain-induced orientation; Mechanical mixing; Nano-crystalline; Amorphous Ti6Al4V |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds) The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Nov 2019 11:14 |
Last Modified: | 22 Oct 2020 00:39 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.wear.2019.203095 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:153728 |
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