ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Microstructure analyses and phase-field simulation of partially divorced eutectic solidification in hypoeutectic Mg-Al alloys

J.-H. Kang, J. Park, K. Song, C.-S. Oh, O. Shchyglo, I. Steinbach.

Journal of Magnesium and Alloys, 10, 1672-1679, (2022)

Nucleation and growth of the β phase in the liquid pocket near the eutectic temperature followed by the nucleation and growth of the α phase in the residual liquid.

In this study the partially divorced eutectic microstructure of α-Mg and β-Mg17Al12 was investigated by electron backscatter diffraction, transmission electron microscopy, and phase-field modeling in hypoeutectic Mg-Al alloys. The orientation relationships between the individual eutectic α grains, eutectic β phase, and primary α grains were investigated. While the amount of eutectic morphology is primarily determined by the Al content, the in-depth microstructure analyses and the phase-field simulation suggest non-interactive nucleation and growth of eutectic α phase in the β phase grown on the interdendritic primary α dendrites. Also, phase-field simulations showed a preferred nucleation sequence where the β phase nucleates first and subsequently triggers the nucleation of eutectic α phase at the moving β phase solidification front, which supports the microstructural analysis results.

Keyword(s): Mg-Al alloy; Partially divorced eutectic; Solidification; Electron backscatter diffraction; Phase-Field modeling
Cite as: https://doi.org/10.1016/j.jma.2021.04.014
DOI: 10.1016/j.jma.2021.04.014
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