Abstract
The growth dynamics of a three-phase eutectic during solidification of a Zn−3Mg−4Al (wt.%) alloy was investigated using synchrotron X-radiography. It was observed in situ that the three-phase eutectic grows with a macrofaceted morphology after nucleating on primary Mg2Zn11. The facets of the three-phase eutectic are due to the leading growth of Mg2Zn11. Density functional theory based calculations confirm that this leading phase has a highly anisotropic equilibrium shape. It was also observed that the eutectic−liquid interface destabilizes in solidification, generating macrosteps into the constitutionally undercooled liquid. The onset of the interfacial instability may have an orientation dependence due to the crystalline anisotropy of Mg2Zn11.
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