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Title: Surface modification of Ti-6Al-4V alloys using triode plasma oxidation treatments
Authors: Cassar, Glenn
Avelar-Batista Wilson, J. C.
Banfield, Sarah
Housden, Jonathan
Matthews, Allan
Leyland, Adrian
Keywords: Triodes
Plasma diffusion
Scanning electron microscopy
Atomic force microscopy
Issue Date: 2012
Publisher: Elsevier B.V.
Citation: Cassar, G., Wilson, J. A. B., Banfield, S., Housden, J., Matthews, A., & Leyland, A. (2012). Surface modification of Ti-6Al-4V alloys using triode plasma oxidation treatments. Surface and Coatings Technology, 206(22), 4553-4561.
Abstract: In this study, triode plasma oxidation (TPO) has been used to improve the tribological characteristics of Ti–6Al–4V. The effect of TPO on ball-on-plate reciprocating-sliding, impact, and micro-abrasion wear resistance of this alloy is investigated. Surface micro-profilometry, nano-/micro-indentation hardness testing, scratch-adhesion testing, scanning electron microscopy (SEM), atomic force microscopy (AFM), glancing-angle X-ray diffraction (GAXRD), and glow-discharge optical emission spectroscopy (GDOES) data is presented to corroborate the effects of the oxidation process. ‘Traditional’ thermal oxidation processes were used to benchmark this novel treatment. Following TPO treatment at 700 °C for only 4 h, a hard (exceeding 11 GPa) and well-adhered oxide layer, composed of mixtures of the anatase and rutile polymorphs of TiO2, was formed at the surface of the Ti-alloy. This layer is accompanied by a much larger oxygen-solution strengthened zone which creates a gradual chemical and mechanical gradient from the hard oxide ‘compound layer’ into the ductile substrate core. The various wear testing methods employed revealed excellent wear resistance of the TPO-treated alloy—compared both to the untreated alloy and to conventional, thermally oxidised samples.
Description: The authors gratefully acknowledge financial support for several as- pects of this research work from the UK Technology Strategy Board, under Technology Programme project TP/22076, in collaboration with Tecvac Ltd., NMB-Minebea UK Ltd., and Airbus UK.
Appears in Collections:Scholarly Works - FacEngMME

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