Author： He Y. Javaid A. Essadiqi E. Shehata M.
Publisher： Maney Publishing
ISSN： 0008-4433
Source： Canadian Metallurgical Quarterly, Vol.48, Iss.2, 2009-06, pp. : 145-155
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Abstract
The solidification process of a wedge-shaped AZ31 (Mg-3%Al-1% Zn in wt%) magnesium alloy casting was simulated using an in-house object-oriented finite element (OOFE) code. The distributions of temperature and solid fraction in the casting at different solidification stages were obtained which revealed the solidification characteristics of the wedge casting. The simulated cooling curves at various locations along the centreline of the casting were compared with those measured by thermocouples and very close cooling behaviours were observed. The cooling rate at the tip of the casting, which is impossible to measure, was calculated based on numerical simulation. The solidification structure, especially the secondary dendrite arm spacing (SDAS), at each thermocouple location was correlated to the local solidification time using a common power function and the associated constants for AZ31 Mg alloy were determined.
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