Neutron diffraction residual strain measurements in nanostructured hydroxyapatite coatings for orthopaedic implants

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dc.contributor.authorAhmed, Ren_AU
dc.contributor.authorFaisal, NHen_AU
dc.contributor.authorParadowska, AMen_AU
dc.contributor.authorFitzpatrick, MEen_AU
dc.contributor.authorKhor, KAen_AU
dc.date.accessioned2012-06-20T04:27:42Zen_AU
dc.date.available2012-06-20T04:27:42Zen_AU
dc.date.issued2011-11-01en_AU
dc.date.statistics2012-06-20en_AU
dc.description.abstractThe failure of an orthopaedic implant can be initiated by residual strain inherent to the hydroxyapatite coating (HAC). Knowledge of the through-thickness residual strain profile in the thermally sprayed hydroxyapatite coating/substrate system is therefore important in the development of a new generation of orthopaedic implants. As the coating microstructure is complex, non-destructive characterization of residual strain, e.g. using neutron diffraction, provides a useful measure of through thickness strain profile without altering the stress field. This first detailed study using a neutron diffraction technique, non-destructively evaluates the through thickness strain measurement in nanostructured hydroxyapatite plasma sprayed coatings on a titanium alloy substrate (as-sprayed, heat treated, and heat treated then soaked in simulated body fluid (SBF)). The influence of crystallographic plane orientation on the residual strain measurement is shown to indicate texturing in the coating. This texturing is expected to influence both the biological and fracture response of HA coatings. Results are discussed in terms of the influence of heat-treatment and SBF on the residual stress profile for these biomedical coatings. The results show that the through thickness residual strain in all three coatings was different for different crystallographic planes but was on average tensile. It is also concluded that the heat-treatment and simulated body fluid exposure had a significant effect on the residual strain profile in the top layers of HAC.(C) 2011 Elsevier Ltd.en_AU
dc.identifier.citationAhmed, R., Faisal, N. H., Paradowska, A. M., Fitzpatrick, M. E., & Khor, K. A. (2011). Neutron diffraction residual strain measurements in nanostructured hydroxyapatite coatings for orthopaedic implants. Journal of the Mechanical Behavior of Biomedical Materials, 4(8), 2043-2054. doi:10.1016/j.jmbbm.2011.07.003en_AU
dc.identifier.govdoc4312en_AU
dc.identifier.issn1751-6161en_AU
dc.identifier.issue8en_AU
dc.identifier.journaltitleJournal of the Mechanical Behavior of Biomedical Materialsen_AU
dc.identifier.pagination2043-2054en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jmbbm.2011.07.003en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4348en_AU
dc.identifier.volume4en_AU
dc.language.isoenen_AU
dc.publisherElseviren_AU
dc.subjectNeutron diffractionen_AU
dc.subjectResiduesen_AU
dc.subjectPlasmaen_AU
dc.subjectCoatingsen_AU
dc.subjectTitaniumen_AU
dc.subjectSubstratesen_AU
dc.titleNeutron diffraction residual strain measurements in nanostructured hydroxyapatite coatings for orthopaedic implantsen_AU
dc.typeJournal Articleen_AU
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