Grain refinement of Mg–Al(–Mn) alloys by SiC additions

The addition of SiC particles effectively grain refined a range of Mg–Al alloys. The greatest reductions in grain size were found for the alloys with lower Al contents. The presence of Mg 2Si in the microstructure after that SiC addition, and consideration of phase equilibria suggested that the SiC...

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Bibliographic Details
Published in:	Scripta materialia 2006-08, Vol.55 (4), p.379-382
Main Authors:	Easton, Mark A, Schiffl, Andreas, Yao, Ji-Yong, Kaufmann, Helmut
Format:	Article
Language:	eng
Subjects:	Alloys Applied sciences Casting Exact sciences and technology Grain refinement Grain refining Intermetallic compounds Intermetallics Magnesium alloys Magnesium base alloys Magnesium compounds Metals. Metallurgy Semiconductors Silicides Silicon carbide Solidification microstructure
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Summary:	The addition of SiC particles effectively grain refined a range of Mg–Al alloys. The greatest reductions in grain size were found for the alloys with lower Al contents. The presence of Mg 2Si in the microstructure after that SiC addition, and consideration of phase equilibria suggested that the SiC transforms to Al 4C 3, and this is the actual nucleant. The addition of Mn poisoned the grain refining effect of the SiC addition, probably due to the formation of less potent Al–Mn–carbides.
ISSN:	1359-6462 0956-716X 1872-8456