Directional Solidification and Microsegregation in a Magnesium-Aluminum-Calcium Alloy

Creep-resistant Mg-4Al-4Ca (AX44) alloy was solidified under different growth/cooling rates using a directional solidification (DS) technique. The solidification behavior and microsegregation of the alloying elements in the castings was investigated. Computational thermodynamics calculations of phas...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2012-09, Vol.43 (9), p.3239-3248
Main Authors: Zheng, Xingwei, Luo, Alan A., Zhang, Chuan, Dong, Jie, Waldo, Richard A.
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Materials creep
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Microstructure
Nanotechnology
Solidification
Structural Materials
Surfaces and Interfaces
Thin Films
Yield stress
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Summary:Creep-resistant Mg-4Al-4Ca (AX44) alloy was solidified under different growth/cooling rates using a directional solidification (DS) technique. The solidification behavior and microsegregation of the alloying elements in the castings was investigated. Computational thermodynamics calculations of phase equilibria and experimental observations confirm that the solidification microstructure in this alloy consists of α -Mg, C36-(Mg,Al) 2 Ca, and C14-Mg 2 Ca phases. A relationship was established between the primary dendrite arm spacing and the cooling rate, which can be used to predict mechanical properties such as yield strength and creep. The microsegregation of alloying elements (Al and Ca) predicted by the Scheil model in AX44 agrees well with the electron probe microanalysis (EPMA) measurements, suggesting that the Scheil model can be used in microstructure simulation of magnesium castings.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-012-1159-8