High temperature in-situ phase stability of sputtered TiAlxN coatings

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Shyam Bharatkumar Patel
  • Ehsan Mohammadpour
  • Nicholas Mondinos
  • Xiaoli Zhao
  • Jean-Pierre Veder
  • And 5 others
  • Zhi-feng Zhou
  • T.S.Y. Moh
  • Willey Yun Hsien Liew
  • Sunghwan Lee
  • Zhong-Tao Jiang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)507-514
Journal / PublicationJournal of Alloys and Compounds
Volume786
Early online date1 Feb 2019
Publication statusPublished - 25 May 2019

Abstract

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.

Research Area(s)

  • Finite element modelling, Hard coating, High temperature SR-XRD, Nanoindentation, TiAlxN thin film, von Mises stress distribution

Citation Format(s)

High temperature in-situ phase stability of sputtered TiAlxN coatings. / Patel, Shyam Bharatkumar; Mohammadpour, Ehsan; Mondinos, Nicholas; Zhao, Xiaoli; Veder, Jean-Pierre; Zhou, Zhi-feng; Moh, T.S.Y.; Hsien Liew, Willey Yun; Lee, Sunghwan; Jiang, Zhong-Tao.

In: Journal of Alloys and Compounds, Vol. 786, 25.05.2019, p. 507-514.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review