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Title

Laser cladding of high strength aluminium alloy 7075 powder on a 7075 substrate for repair of damaged components

Author(s)

Cottam, R.;  Liu, Q.;  Wong, Y. C.;  Wang, J.;  Brandt, M.

Abstract

Laser cladding is a surface engineering technique that has been employed in this investigation to develop a repair technique for high strength aluminium alloy components. High strength aluminium alloys are used in a variety of situations due to their good combination of high strength and low density. Repair of such components has the potential for cost savings for both the defence and aerospace sectors. Aluminium alloy 7075 powder was laser clad onto a substrate of 7075 and the character of the microstructure in both the clad layer and heat affected zone was evaluated. It was found that the fine precipitates that provide the strength in this class of alloy had grown and coalesced due to the heat supplied by the laser and weakened the heat affected zone from a structural point of view. A solution heat treatment and T6 aging procedure was applied to restore the strength in this region. After the heat treatment, hardness traverse profiles revealed that the hardness in the clad layer was lower than that of the substrate. This was attributed to the evaporation of magnesium and zinc during cladding and the higher concentration of iron in the powder forming an insoluble phase with zinc and magnesium in the clad layer. Both of these factors ultimately reduce the volume of the strengthening phases.

Publication type

Conference paper

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Industrial Research Institute Swinburne

Source

Materials Forum: proceedings of the Materials Innovations in Surface Engineering Conference (MISE 2011), Melbourne, Victoria, Australia, 18-20 October 2011, pp. 89-94

Publication year

2011

Keyword(s)

Aluminium alloy;  Aluminium alloy 7075 powder;  Laser cladding;  Repair techniques;  Strength

Publisher

Institute of Materials Engineering Australasia

ISSN

1447-6738 (series ISSN)

ISBN

9781876855369, 1876855363

Publisher URL

http://www.materialsaustralia.com.au/

Copyright

Copyright © Institute of Materials Engineering Australasia Ltd (2011). The Institute grants the author a free licence to republish the article provided that the prior IMEA publication is acknowledged. The published version is reproduced in accordance with this policy.

Full text

Peer reviewed