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Phase transition in CrxAl(1-x)N coating at high temperatures

Mohammadpour, E., Rahman, M.M., Ibrahim, K., Widjaja, H., Mondinos, N. and Jiang, Z-T (2014) Phase transition in CrxAl(1-x)N coating at high temperatures. In: Centenary Postgraduate Symposium. Royal Society of Western Australia, 3rd October 2014, Webb Lecture Theatre, University of Western Australia.

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Transition metal nitrides (say TiN and CrN) have widespread industrial applications as they provide wear protection, high temperature and corrosion resistance, good adhesion and very high hardness. Over the past few years, CrNs have been used in cutting, milling and screw-threading tools due to their better thermal stability, corrosion and wear resistances. In this work, Al doped CrN superhard coatings are studied for their thermal stability. Surface and cross sectional morphology of the coating was investigated using Scanning Electron Microscopy (SEM) equipped with Energy Dispersive Spectroscopy (EDS) detector. Synchrotron radiation powder diffraction beamline was used to investigate the microstructure and phase transition of the coating layers within temperature range of 25 ˚C to 700 ˚C in steps of 100 ˚C. SEM study revealed interesting elemental distribution over the coating layers. Results indicated that CrN and Cr2N are the main structural phases at 25 ˚C and 700 ˚C, respectively. Dominant structural changes during annealing results in the gradual transformation of cubic CrN phase to the hexagonal Cr2N phase. In addition, recrystallization of CrN and Cr2N phases with preferential growth directions were observed. As the temperature increased the width of the peaks were reduced while their increased intensity indicate the grain growth in the coating layers.

Publication Type: Conference Item
Murdoch Affiliation: School of Engineering and Information Technology
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