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Advances in Materials Science and Engineering
Volume 2017, Article ID 7408641, 10 pages
https://doi.org/10.1155/2017/7408641
Research Article

Effect of Aluminum Addition on the Microstructure, Tensile Properties, and Fractography of Cast Mg-Based Alloys

1Département des Sciences Appliquées, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada
2Materials Engineering, General Motors, 823 Joslyn Avenue, Pontiac, MI 48340, USA

Correspondence should be addressed to F. H. Samuel; ac.caqu@leumashf

Received 14 March 2017; Revised 2 May 2017; Accepted 6 June 2017; Published 10 August 2017

Academic Editor: Antonino Squillace

Copyright © 2017 M. H. Abdelaziz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The present study was performed on Mg-based alloys containing Zn and Mn. The alloys were cast in a permanent metallic mold preheated to 200°C and with a protective atmosphere of dry air, CO2, and SF6. Two main phases are observed in the as-cast condition: Mg-Al-Zn and Mn-Al intermetallics. The size and morphology of the Mg-Al-Zn phase are significantly affected by the concentration of Al. Tensile properties, using standard ASTM B-108 samples, are directly related to the size, morphology, and density of the existing phase particles. The alloy ductility is reduced with increase in the Al concentration, whereas the ultimate tensile strength and the yield strength are more or less stable. The fracture surface of the tested tensile bars is mostly ductile for low Al-containing alloys and tends to be brittle with the increase in Al content as evidenced by an increase in the density of cleavage ruptured areas.