Abstract
This paper builds on the “Grain Refinement of Mg Alloys” published in 2005 and reviews the grain refinement research on Mg 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.
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Acknowledgments
Support was provided by the CAST CRC, ARC Discovery Grants DP120101672 (DStJ, MQ) and DP2010000071 (ME, JT), ARC CoE for Design in Light Metals (MQ), and the Centre for Advanced Materials Processing and Manufacturing (AMPAM) at UQ (DStJ, MQ, JT). Dr Carlos Cáceres of the UQ is thanked for the stimulating discussion on the strengthening effect of magnesium alloys caused by a reduction in grain size.
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StJohn, D.H., Easton, M.A., Qian, M. et al. Grain Refinement of Magnesium Alloys: A Review of Recent Research, Theoretical Developments, and Their Application. Metall Mater Trans A 44, 2935–2949 (2013). https://doi.org/10.1007/s11661-012-1513-x
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DOI: https://doi.org/10.1007/s11661-012-1513-x