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Metals 2016, 6(8), 185;

On the Improvement of AA2024 Wear Properties through the Deposition of a Cold-Sprayed Titanium Coating

Department of Chemical, Materials and Industrial Production Engineering, University of Naples Federico II, P. Tecchio 80, Naples 80125, Italy
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, Fisciano, Salerno 84084, Italy
Department of Industrial and Information Engineering, Second University of Naples, Via Roma 29, Aversa (Ce) 81031, Italy
CIRTIBS Research Centre, University of Naples Federico II, P.le Tecchio 80, Naples 80125, Italy
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Received: 25 March 2016 / Revised: 29 July 2016 / Accepted: 4 August 2016 / Published: 11 August 2016
(This article belongs to the Special Issue Aluminum Alloys)
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This paper deals with the study of the enhancement of the tribological properties of AA2024 through the deposition of a titanium coating. In particular two different coatings were studied: (1) untreated titanium coating; and (2) post-deposition laser-treated titanium coating. Titanium grade 2 powders were deposited onto an aluminium alloy AA2024-T3 sheet through the cold gas dynamic spray process. The selective laser post treatment was carried out by using a 220 W diode laser to further enhance the wear properties of the coating. Tribo-tests were executed to analyse the tribological behaviour of materials in contact with an alternative moving counterpart under a controlled normal load. Four different samples were tested to assess the effectiveness of the treatments: untreated aluminium sheets, titanium grade 2 sheets, as-sprayed titanium powders and the laser-treated coating layer. The results obtained proved the effectiveness of the coating in improving the tribological behaviour of the AA2024. In particular the laser-treated coating showed the best results in terms of both the friction coefficient and mass lost. The laser treatment promotes a change of the wear mechanism, switching from a severe adhesive wear, resulting in galling, to an abrasive wear mechanism. View Full-Text
Keywords: AA 2024; titanium; cold spray; laser treating; coating; wear; tribotest AA 2024; titanium; cold spray; laser treating; coating; wear; tribotest

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Astarita, A.; Rubino, F.; Carlone, P.; Ruggiero, A.; Leone, C.; Genna, S.; Merola, M.; Squillace, A. On the Improvement of AA2024 Wear Properties through the Deposition of a Cold-Sprayed Titanium Coating. Metals 2016, 6, 185.

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