A novel approach to the mechanism for the grain refining effect of melt superheating of Mg-Al alloys

Qiu, D., Zhang, M.-X., Taylor, J. A., Fu, H. and Kelly, P. M. (2007) A novel approach to the mechanism for the grain refining effect of melt superheating of Mg-Al alloys. Acta Materialia, 55 6: 1863-1871.


Author Qiu, D.
Zhang, M.-X.
Taylor, J. A.
Fu, H.
Kelly, P. M.
Title A novel approach to the mechanism for the grain refining effect of melt superheating of Mg-Al alloys
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2007
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.actamat.2006.10.047
Volume 55
Issue 6
Start page 1863
End page 1871
Total pages 9
Editor Mahajan, S.
Place of publication United Kingdom
Publisher Pergamon
Collection year 2008
Language eng
Subject 291403 Alloy Materials
291302 Physical Metallurgy
671000 Fabricated Metal Products
C1
Abstract The possible grain refining candidates for Mg-Al alloys that may occur in the superheating process have been systematically studied from a crystallographic perspective. The edge-to-edge matching model was used to investigate and compare the grain refining efficiency of various (Al, Mn) containing phases existing in the melt. The results show that the metastable tau-AlMn phase possesses significantly better crystallographic matching to the Mg matrix than the other Al-Mn intermetallic phases and could therefore serve as an effective heterogenous nucleation site. However, since the metastable tau-AlMn phase can only be generated from the high temperature epsilon-Alkin phase through a massive transformation, overheating the melt is necessary to produce the high temperature epsilon-AlMn phase. During the subsequent cooling to pouring temperatures, the epsilon-AlMn phase will partially or fully transform into the tau-AlMn phase, which in turn can act as a nucleation site. The. rapid cooling and the short isothermal holding time prevent it from further transforming into the equilibrium Al8Mn5 and beta-Mn phases. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Keyword Crystallography
Edge-to-edge matching
Grain refining
Manganese
Mg–Al alloys
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Thu, 24 Apr 2008, 15:16:06 EST by Sally Beard on behalf of Materials