Pulsed laser surface treatment of magnesium alloy: Correlation between thermal model and experimental observations

Samant, Anoop N and Du, Baoshuai and Paital, Sameer and Kumar, S and Dahotre, Narendra B (2009) Pulsed laser surface treatment of magnesium alloy: Correlation between thermal model and experimental observations. In: Journal of Materials Processing Technoogy, 209 (11). pp. 5060-5067.

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Abstract

The effect of deposition of Al +Al2O3 on MRI 153 M Mg alloy processed using a pulsed Nd:YAG laser is presented in this study. A composite coating with metallurgical joint to the substrate was formed. The microstructure and phase constituents were characterized and correlated with the thermal predictions. The laser scan speed had an effect on the average melt depth and the amount of retained and/or reconstituted alumina in the final coating. The coating consisted of alumina particles and highly refined dendrites formed due to the extremely high cooling rates (of the order of 10(8) K/s). The microhardness of the coating was higher and several fold improvement of wear resistance compared to the substrate was observed for the coatings. These microstructural features and physical properties were correlated with the effects predicted by a thermal model.

Item Type:	Journal Article
Publication:	Journal of Materials Processing Technoogy
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Pulsed laser; Thermal modeling; MRI 153 M Mg alloy; Microhardness; Melt depth
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	04 Jan 2010 10:50
Last Modified:	19 Sep 2010 05:37
URI:	http://eprints.iisc.ac.in/id/eprint/21332

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