Coating of Ti-6Al-4V alloy substrates with TiN/Ti multi-layered films by magnetron sputtering T. Sonoda, S. Kotake, K. Katou and T. Asahina Eur. Phys. J. Appl. Phys., 38 1 (2007) 69-72 Published online: 14 March 2007 DOI: 10.1051/epjap:2007050