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Structural and mechanical characterisations of CrAlN coatings via In-situ synchrotron radiation XRD analysis

Mohammadpour, E., Jiang, Z-T, Altarawneh, M., Mondinos, N. and Dlugogorski, B.Z. (2017) Structural and mechanical characterisations of CrAlN coatings via In-situ synchrotron radiation XRD analysis. In: Australian X-ray Analytical Association (AXAA) 2017, 5 - 9 February 2017, Melbourne, Australia.

Abstract

In-situ synchrotron X-ray diffraction (SR-XRD) measurement, in the temperature range of 25 - 700 °C, was carried out to ascertain the crystalline phases transformation of magnetron sputtered Cr1-xAlxN thin films. The Rietveld refinement method, using TOPAS software, was employed to analyse the crystalline phase compositions, crystallite sizes, microstrain and residual stresses of these coatings. The main crystalline phases below 600 °C were a combination of c-CrN and c-AlN while at higher temperatures the phase composition also included α-Cr with small amounts of Al2O and Al2O3. The mechanical properties (hardness and elastic modulus) of the coatings were measured by Nanoindentation techniques at room temperature. A combination of refinement results and nanoindentation data indicated that Al-dopants effectively refines the microstructure and improves the hardness and elastic modulus of the coatings in as-deposited and annealed conditions. In addition, Al dopants slow down the growth of crystallite and stress release in the coating lattice at high temperature.

Publication Type: Conference Item
Murdoch Affiliation: School of Engineering and Information Technology
Conference Website: http://www.axaa.org/
URI: http://researchrepository.murdoch.edu.au/id/eprint/36065
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