TiAlN/VN superlattice structured PVD coatings: A new alternative in machining of aluminium alloys for aerospace and automotive components

HOVSEPIAN, P. E., LUO, Q., ROBINSON, G., PITTMAN, M., HOWARTH, M., DOERWALD, D., TIETEMA, R., SIM, W. M., DEEMING, A. and ZEUS, T. (2006). TiAlN/VN superlattice structured PVD coatings: A new alternative in machining of aluminium alloys for aerospace and automotive components. Surface and Coatings Technology, 201 (1-2), 265-272.

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Abstract

A 3 mu m thick superlattice structured TiAlN/VN coating has been deposited by the steered cathodic arc/unbalanced magnetron sputtering technique. The coating has been tested in dry high-speed milling of aluminium alloys Al7010-T7651 and AlSi9Cu1 and the performance compared to that of the diamond-like carbon (DLC) coated, TiAlCrYN coated and uncoated tools. In milling the Al7010-T7651 alloy, TiAIN/VN and DLC coated tools showed comparable performance, outperforming TiAlCrYN coated and uncoated tools by a factor of 2.3 and 3.5, respectively. In the case of milling AlSi9Cu1, the DLC coatings failed to produce any lifetime improvement, TiAlCrYN showed similar to 65% longer lifetime thus rendering TiAlN/VN as the best performing coating with 100% longer lifetime compared to that of the uncoated tools. The tests further showed that TiAlN/VN reduces the cutting forces and improves the surface finish. Scanning electron microscopy of the cutting edge carried out after the cutting tests showed that the TiAlN/VN coating significantly reduces metal transfer and built-up edge formation. (c) 2005 Elsevier B.V. All rights reserved.

Item Type:	Article
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research Materials and Engineering Research Institute > Materials Analysis and Research Services
Identification Number:	10.1016/j.surfcoat.2005.11.106
Depositing User:	Ann Betterton
Date Deposited:	17 Feb 2010 16:09
Last Modified:	10 Sep 2010 12:09
URI:	http://shura.shu.ac.uk/id/eprint/1119

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