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Laser Surface Alloying of a Creep Resistant Magnesium Alloy MRI 230D with Al and Al2O3

Rapheal, G and Kumar, S and Blawert, C and Dahotre, Narendra B (2010) Laser Surface Alloying of a Creep Resistant Magnesium Alloy MRI 230D with Al and Al2O3. In: Magnesium Technology Symposium 2010, FEB 14-18, 2010, Seattle, WA, pp. 161-166.

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Abstract

A creep resistant permanent mould cast Mg alloy MRI 230D was laser surface alloyed with Al and a mixture of Al and Al2O3 using pulsed Nd:YAG laser irradiation at four different scan speeds in order to improve the corrosion and wear resistance. The microstructure, corrosion and wear behavior of the laser surface alloyed material is reported in this manuscript. The coating comprised of a featureless microstructure with cellular-dendritic microstructure near the interface and exhibited good interfacial bonding. A few solidification cracks reaching down to substrate were also observed. The two step coating with Al followed by a mixture of Al and Al2O3 exhibited a slightly better corrosion resistance than the single step coating with Al. In the long run, however, corrosion resistance of both the coatings became comparable to the as-cast alloy. The corroded surface of the laser surface alloyed specimens revealed a highly localized corrosion. The laser surface alloyed specimens exhibited an improvement in wear resistance. The laser scan speed did not exhibit a monotonic trend either in corrosion or wear resistance.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Minerals Metals Materials Soc.
Keywords: Magnesium alloy;Laser surface alloying;Microstructure; Corrosion;Wear.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 14 Feb 2011 08:54
Last Modified: 14 Feb 2011 08:54
URI: http://eprints.iisc.ernet.in/id/eprint/32259

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