Laser surface cladding of MRI 153M magnesium alloy with (Al+Al2O3)

Hazra, M and Mondal, AK and Kumar, S and Blawert, C and Dahotre, Narendra B (2009) Laser surface cladding of MRI 153M magnesium alloy with (Al+Al2O3). In: Surface and Coatings Technology, 203 (16). pp. 2292-2299.

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Abstract

Laser surface cladding was carried out on a creep-resistant MRI 153M magnesium alloy with a mixture of Al and Al2O3 powders using a pulsed Nd:YAG laser at scan speeds of 21, 42, 63 and 84 mm/s. The Al2O3 particles partially or completely melted during laser irradiation and re-solidified with irregular shapes in the size range of 5–60 µm along with a few islands as large as 500 µm, within the grain-refined Mg-rich dendritic matrix. More than an order of magnitude improvement in wear resistance after cladding was attributed to the presence of ultra-hard Al2O3 particles, increased solid solubility of Al and other alloying elements, and a very fine dendritic microstructure as a result of rapid solidification in the cladded layer. However, corrosion resistance of the laser cladded alloy was reduced by almost an order of magnitude compared to that of the as-cast alloy mainly due to the presence of cracks and pores in the cladded layer.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Magnesium alloy;Laser surface cladding;Microstructure;Wear;Corrosion.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	28 Aug 2009 12:36
Last Modified:	19 Sep 2010 05:33
URI:	http://eprints.iisc.ernet.in/id/eprint/20536

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