Grain refinement of magnesium alloys: a review of recent research, theoretical developments and their application

St John, D. H., Easton, M. A., Qian, M. and Taylor, J. A. (2013) Grain refinement of magnesium alloys: a review of recent research, theoretical developments and their application. Metallurgical and Materials Transactions A, 44 7: 2935-2949. doi:10.1007/s11661-012-1513-x

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Author St John, D. H.
Easton, M. A.
Qian, M.
Taylor, J. A.
Title Grain refinement of magnesium alloys: a review of recent research, theoretical developments and their application
Journal name Metallurgical and Materials Transactions A   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2013-07-01
Year available 2012
Sub-type Article (original research)
DOI 10.1007/s11661-012-1513-x
Open Access Status File (Author Post-print)
Volume 44
Issue 7
Start page 2935
End page 2949
Total pages 15
Place of publication New York, NY, United States
Publisher Springer
Language eng
Abstract This paper builds on the ‘‘Grain Refinement of Mg Alloys’’ published in 2005 and reviews the grain refinement research onMg alloys that has been undertaken since then with an emphasis on the theoretical and analytical methods that have been developed. Consideration of recent research results and current theoretical knowledge has highlighted two important factors that affect an alloy’s as-cast grain size. The first factor applies to commercial Mg-Al alloys where it is concluded that impurity and minor elements such as Fe and Mn have a substantially negative impact on grain size because, in combination with Al, intermetallic phases can be formed that tend to poison the more potent native or deliberately added nucleant particles present in the melt. This factor appears to explain the contradictory experimental outcomes reported in the literature and suggests that the search for a more potent and reliable grain refining technology may need to take a different approach. The second factor applies to all alloys and is related to the role of constitutional supercooling which, on the one hand, promotes grain nucleation and, on the other hand, forms a nucleation-free zone preventing further nucleation within this zone, consequently limiting the grain refinement achievable, particularly in low solute-containing alloys. Strategies to reduce the negative impact of these two factors are discussed. Further, the Interdependence model has been shown to apply to a broad range of casting methods from slow cooling gravity die casting to fast cooling high pressure die casting and dynamic methods such as ultrasonic treatment.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online 8 November 2012

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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Created: Wed, 27 Mar 2013, 18:42:54 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering