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High temperature in-situ phase stability of sputtered TiAlxN coatings

Patel, S.B., Mohammadpour, E., Mondinos, N., Zhao, X., Veder, J-P, Zhou, Z., Moh, T.S.Y., Hsien Liew, W.Y., Lee, S. and Jiang, Z-T (2019) High temperature in-situ phase stability of sputtered TiAlxN coatings. Journal of Alloys and Compounds, 786 . pp. 507-514.

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The temperature dependence of phase composition and lattice parameters, for TiAlxN thin film coating, are experimentally investigated by in-situ synchrotron radiation X-ray diffraction (SR-XRD), at temperatures between 25 °C and 700 °C. Mechanical properties, such as: Young's modulus (E), hardness (H) and plastic deformation index (PDI) – were experimentally determined by nanoindentation, at 25 °C. Crystalline structural analysis, of SR-XRD results, indicates the major phases are TiN and AlN; with Ti2O and TiO2 phases also present above 600 °C. The lattice constants increased with an increase in temperature. Atomic and phase compositions, at 25 °C, were also verified by X-ray photoelectron spectroscopy (XPS). Field emission scanning electron microscopy (FESEM) images display an increase in surface roughness and reduction in grain size, with increasing Aluminium percentage (Al%). Nanoindentation analysis showed a maximum hardness of 25.1 ± 1.5 GPa (sample containing 12% Al), which was subsequently reduced upon addition of more Aluminium. Finite element modelling (FEM), including von Mises stress distribution, indicates lower mechanical integrity, for samples with high Al% content.

Item Type: Journal Article
Murdoch Affiliation: School of Engineering and Information Technology
Publisher: Elsevier
Copyright: © 2019 Published by Elsevier B.V.
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