Investigation of the non-equilibrium solidification microstructure of a Mg–4Al–2RE (AE42) alloy

The solidification microstructures of AE42 (Mg–4Al–2RE, wt%) alloys with three different cooling rates are investigated using CALculation of PHase Diagrams (CALPHAD) simulation and experimental validation. The results show that high cooling rates can refine the microstructure and decrease the format...

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Bibliographic Details
Published in:Journal of materials science 2016-07, Vol.51 (13), p.6287-6294
Main Authors: Sun, Weihua, Shi, Xiaoying, Cinkilic, Emre, Luo, Alan A.
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Casting
Casting alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Computer simulation
Cooling
Cooling rate
Crystallography and Scattering Methods
Die casting
Foundry practice
Intermetallic compounds
Magnesium
Magnesium base alloys
Materials Science
Mathematical models
Microstructure
Original Paper
Phase diagrams
Phase transformations
Phase transitions
Polymer Sciences
Pressure casting
Pressure die casting
Solid Mechanics
Solidification
Specialty metals industry
Supersaturation
Thermal properties
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Summary:The solidification microstructures of AE42 (Mg–4Al–2RE, wt%) alloys with three different cooling rates are investigated using CALculation of PHase Diagrams (CALPHAD) simulation and experimental validation. The results show that high cooling rates can refine the microstructure and decrease the formation of particulate Al 2 RE intermetallics. Particularly, the Mg 17 Al 12 phase, predicted by CALPHAD simulation using the Scheil model, is not observed in the high-pressure die casting (HPDC) sample. The suppression of Mg 17 Al 12 in HPDC AE42 alloy at high cooling rates and high pressure is likely due to the supersaturation of Al in (Mg), in addition to the preferential formation of Al 11 RE 3 and Al 2 RE phases.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-016-9925-4