Oxidation of Hot Extruded AZ31 Magnesium Alloys Containing Initially Added CaO Particles

Kwon Yong Ji; Dong Bok Lee

doi:10.4028/www.scientific.net/DDF.369.95

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Oxidation of Hot Extruded AZ31 Magnesium Alloys Containing Initially Added CaO Particles
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 369Oxidation of Hot Extruded AZ31 Magnesium Alloys...

Oxidation of Hot Extruded AZ31 Magnesium Alloys Containing Initially Added CaO Particles

Abstract:

AZ31magnesium alloys with initially added (0.5, 1, 1.5) wt.% CaO particles were cast, hot extruded, and oxidized between 450 and 650°C in atmospheric air. Initially added CaO particles reacted with the AZ31 melt, and precipitated as Al₂Ca along the grain boundaries of the α-Mg matrix. They increased the oxidation resistance of the AZ31 alloys. The more CaO particles was, the better the oxidation resistance of the alloys was. During oxidation, MgO oxide scales that incorporated CaO formed at the surface of the AZ31 alloys.