Abstract
We report a kind of spherical ternary eutectic cell formed within an undercooled liquid Al74.6Cu17.2Mg8.2 alloy under containerless and reduced-gravity conditions during free fall. A morphological transition from lamellar to anomalous eutectic growth occurs at large degrees of undercooling. The ternary (α + θ + S) eutectic cell exhibits perfectly spherical characteristics because of the radial symmetry of the temperature and concentration fields inside a falling droplet. For the smallest droplet undercooled by 283 K (0.36T E), the anomalous ternary eutectic grows radially from a preferentially nucleated site of α phase and forms only one spherical eutectic cell occupying the whole droplet. The crystalline orientation relationship is determined as and [101]α//[110]θ between the α and θ phases and and [101]α//[013] S between the α and S phases. The volume fractions of each phase within the (α + θ + S) ternary eutectic depend strongly on the degree of undercooling.
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