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Structural characterizations of magnetron sputtered CrSiN and CrNiN coatings via in-situ Synchrotron radiation XRD analysis

Mohammadpour, E., Jiang, Z-T, Mondinos, N., Rahman, M.M., Altarawneh, M. and Dlugogorski, B.Z. (2016) Structural characterizations of magnetron sputtered CrSiN and CrNiN coatings via in-situ Synchrotron radiation XRD analysis. In: Australian Institute of Physics (AIP) WA 2016 Postgraduate Conference, 13 October 2016, University of Western Australia, Perth

Abstract

Magnetron sputtered CrN based coatings have wide use of applications as protective coatings for cutting/machining tools that require higher thermal/chemical stability and superior mechanical properties at high temperatures [1]. Incorporation of AI[2], Si[3], and Ni[4] to the binary CrN structure can substantially improve their mechanical propetiies. However, measurements of the mechanical properties at high temperatures are very difficult or impossible to obtain due to instrumental limitations. The aim of this study is to predict the mechanical properties of CrSiN and CrNiN coatings, from in-situ Synchrotron Radiation X-ray Diffraction (SR-XRD) measurements exposed at high temperatures (25 °C to 700 °C). Rietveld refinement of the SRXRD, using TOP AS software, data on the phase compositions, crystallite sizes, microstrain and residual stresses of these coatings were analysed. Similarly Nanoindentation measurements, at room temperature, were undetiaken with all of these coatings. Analysis of the refinement and nanoindentation data indicate that Si-dopants effectively lowers crystalline growth and stress release in the coating lattice as temperature is increased to 700 oc and as a result the thermal stability of the coating is remarkably enhanced. However, Ni doping was unsuccessful in stabilizing the crystal structure of CrN coatings at elevated temperatures. In conclusion, high hardness of CrSiN and reduction of hardness for CrNiN coatings, after annealing to temperatures up to 700 °C, is confirmed by the microstructure analyses from SR-XRD data in combination with Nanoindentation measurements.

Publication Type: Conference Paper
Murdoch Affiliation: School of Engineering and Information Technology
Conference Website: http://www.physics.uwa.edu.au/postgraduate-confere...
URI: http://researchrepository.murdoch.edu.au/id/eprint/34036
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