Eutectic Phase Investigation in a Ca-added AM50 Magnesium Alloy Produced by Die Casting

Yoshihiro Terada; Naoya Ishimatsu; Yukako Mori; Tatsuo Sato

doi:10.2320/matertrans.46.145

Yoshihiro Terada, Naoya Ishimatsu, Yukako Mori, Tatsuo Sato

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Keywords: magnesium alloy, die-cast, phase identification, Al₂Ca, magnesium-aluminum-calcium ternary system

JOURNAL FREE ACCESS

2005 Volume 46 Issue 2 Pages 145-147

DOI https://doi.org/10.2320/matertrans.46.145

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Abstract

The eutectic phase in a 1.72 mass pct calcium added AM50 die-cast alloy homogenized at 673 K has been investigated by X-ray diffraction (XRD) and energy dispersive spectrometry (EDS). The XRD and EDS experiments indicate that the eutectic phase consists of a Al₂Ca phase with the C15 structure and contains 10.76 atomic pct magnesium in the equilibrium state. The solubility lobe of the Al₂Ca phase lies parallel to the equi-66.7 at%Al composition line in the Mg-Al-Ca ternary grid, indicating that magnesium preferentially substitutes the calcium site of the Al₂Ca phase.

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