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A new type of (TiZrNbTaHf)N/MoN nanocomposite coating: Microstructure and properties depending on energy of incident ions

A novel (TiZrNbTaHf)N/MoN nanocomposite coatings, which consist of the nitride of the high-entropy alloy and the binary nitride, were synthesized by vacuum-arc deposition at various substrate biases. The elemental composition, chemical bonding state, phase structure, microstructure and mechanical properties of the coatings were studied by high-resolution experimental methods: SIMS, GDMS, XPS, XRD, HR-TEM and nano-indentation. It was found that the chemical state of the (TiZrNbTaHf)N/MoN coatings has a complex nature, which consist of a mixture of nitrides of constituting elements. It was also shown that the coatings are based on B1 NaCl-structured ?-Mo2N-phase with a mixture of crystallographic orientations (111), (200), (220) and (311) together with the B1 NaCl-structured (TiZrNbTaHf)N solid-solution phase. First-principles calculations demonstrated that the metal sub-lattice of the (TiZrNbTaHf)N solid solution can be based on Ti1-xHfyTa1-x-y, Zr1-xHfyTa1-x-y, Zr0.25Ti0.25Ta0.5 ternary alloys, which have the lowest mixing energy. The HR-TEM results showed that the nanocomposite nitride coatings have nano-scale multilayer structure with modulation periods ranged from 20?nm to 25?nm. The maximum hardness of approximately 29?GPa demonstrated the coating deposited at a higher energy condition (?200?V) with the thinnest modulation period of bilayer of 20?nm (15?nm of (TiZrNbTaHf)N and 5?nm of Mo2N).

» Author: A.A. Bagdasaryan, A.V. Pshyk, L.E. Coy, P. Konarski, M. Misnik, V.I. Ivashchenko, M. Kempi?ski, N.R. Mediukh, A.D. Pogrebnjak, V.M. Beresnev, S. Jurga

» Reference: Composites Part B: Engineering, Volume 146

» Publication Date: 01/08/2018

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [609149].

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