High temperature in-situ phase stability of sputtered TiAl x N coatings

Document Type

Journal Article

Publication Title

Journal of Alloys and Compounds

Publisher

Elsevier Ltd

School

School of Engineering

RAS ID

28114

Comments

Patel, S. B., Mohammadpour, E., Mondinos, N., Zhao, X., Veder, J. -., Zhou, Z. -., . . . Jiang, Z. -. (2019). High temperature in-situ phase stability of sputtered TiAl x N coatings. Journal of Alloys and Compounds, 786, 507-514. Available here

Abstract

The temperature dependence of phase composition and lattice parameters, for TiAl x N 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 Ti 2 O and TiO 2 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. © 2019

DOI

10.1016/j.jallcom.2019.01.379

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