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    Crystallinity, surface morphology, and chemical composition of the recast layer and rutile-TiO2 formation on Ti-6Al-4V ELI by wire-EDM to enhance biocompatibility

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    Authors
    Rahman, S.
    Ashraf, M.
    Bashar, M.
    Kamruzzaman, M.
    Nurul Amin, A.
    Hossain, Mofazzal
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Rahman, S. and Ashraf, M. and Bashar, M. and Kamruzzaman, M. and Nurul Amin, A. and Hossain, M. 2017. Crystallinity, surface morphology, and chemical composition of the recast layer and rutile-TiO2 formation on Ti-6Al-4V ELI by wire-EDM to enhance biocompatibility. International Journal of Advanced Manufacturing Technology: pp. 1-12.
    Source Title
    International Journal of Advanced Manufacturing Technology
    DOI
    10.1007/s00170-017-0772-5
    ISSN
    0268-3768
    School
    Department of Petroleum Engineering
    URI
    http://hdl.handle.net/20.500.11937/55897
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Springer-Verlag London Ltd. In this study, the surface morphology, chemical composition, and crystallography of the recast layer on wire electrical discharge machining (wire-EDM) modified Ti-6Al-4V ELI were investigated through scanning electron microscopy, backscattered electron imaging, energy-dispersive x-ray spectroscopy, and x-ray diffraction. The characteristics of the two tailored cutting strategies, namely, main cut and finish trim cut, were evaluated in terms of micro-cracks, micro-pores, recast layer thickness (RLT), surface roughness (SR), phase transition, and micro-hardness. In addition, the relative changes of the SR, RLT, and kerf width were demonstrated with regard to peak current and pulse spacing. Noticeably fewer amounts of micro-cracks, micro-voids, remarkable truncation of RLT and SR, and nanoporous structure were attained at finish trim cut mode. It was also found out that an a ? a' + rutile-TiO 2 phase transition occurred on the recast layer of wire-EDM modified sample at finish trim cut. Furthermore, recast layer showed higher micro-hardness compared to that of the heat-affected zone and bulk material. In essence, the wire-EDM finish trim cut treatment is a potential technology to feasibly enhance the biocompatibility for Ti-6Al-4V ELI alloy through the formation of rutile-TiO 2 and amelioration of the surface morphology.

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