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Metallurgical and Materials Transactions A

Published in:

01-09-2012

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

Authors: Xingwei Zheng, Alan A. Luo, Chuan Zhang, Jie Dong, Richard A. Waldo

Published in: Metallurgical and Materials Transactions A | Issue 9/2012

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Abstract

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)₂Ca, and C14-Mg₂Ca 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.

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Title: Directional Solidification and Microsegregation in a Magnesium-Aluminum-Calcium Alloy
Authors: Xingwei Zheng
Alan A. Luo
Chuan Zhang
Jie Dong
Richard A. Waldo
Publication date: 01-09-2012
Publisher: Springer US
Published in: Metallurgical and Materials Transactions A / Issue 9/2012
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI: https://doi.org/10.1007/s11661-012-1159-8

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