Correlation between the formation of tribofilm and repassivation in biomedical titanium alloys during tribocorrosion

Yidong Xu, Jiahui Qi, John Nutter, Joanne Sharp, Mingwen Bai, Le Ma, W.M. Rainforth

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    4 Citations (Scopus)
    9 Downloads (Pure)

    Abstract

    Titanium alloys are widely used in the field of orthopaedics, however, poor tribological performance arising from the low shear resistance and weak protection of the oxide layer limits their applicability. In this work, the tribocorrosion behaviour of novel β and α + β biomedical titanium alloys were studied in bovine serum solution under open circuit potential. Ti-5Mo-Fe-3Sn and Ti-6Al-4V ELI alloys were found to have the capability to repassivate when testing at a slower sliding speed. Scanning and transmission electron microscopy results revealed that the repassivation was mainly associated with the greater tribofilm formation on the worn surface, rather than an oxide film. The tribolayer performed as a solid lubricating film, which stabilised the coefficient of friction.
    Original languageEnglish
    Article number107147
    JournalTribology International
    Volume163
    Early online date24 Jun 2021
    DOIs
    Publication statusPublished - Nov 2021

    Bibliographical note

    © 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-
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    Funder

    This work was supported by the Henry Royce Institute for Advanced Materials under EPSRC Grant EP/R00661X/1 and also the EPSRC Programme Grant, Friction: The Tribology Enigma, EP/R001766/1 .

    Keywords

    • Titanium alloys
    • Tribocorrosion
    • Repassivation
    • Tribofilm
    • Electron microscopy

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Surfaces, Coatings and Films
    • Surfaces and Interfaces

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