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Anomalous Halo Formation in an Arc-Melted ScNi-Sc2Ni Off-Eutectic Binary Alloy

State Key Laboratory of Powder Metallugy, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Academic Editor: Jordi Sort
Materials 2016, 9(7), 584;
Received: 24 June 2016 / Revised: 12 July 2016 / Accepted: 13 July 2016 / Published: 18 July 2016
Diverse non-equilibrium eutectic structures have attracted numerous experimental and theoretical studies. One special type is the formation of a halo of one phase around a primary dendrite of another phase. In our experiments, it was occasionally observed that ScNi halos grow as dendritic morphology around the primary Sc 2 Ni dendrites in an arc-melted ScNi-Sc 2 Ni off-eutectic binary alloy. The formation of this anomalous halo structure was then well reproduced by employing quantitative phase-field simulations. Based on the phase-field simulation, It was found that (i) the large undercooling and growth velocity of the ScNi phase during solidification causes the formation of halos; and (ii) the released latent heat induces the recalescence phenomenon, and changes the solidification sequence largely, resulting in the anomalous halo structure in the Sc-34 at % Ni alloy. View Full-Text
Keywords: anomalous halo; eutectic solidification; phase-field model anomalous halo; eutectic solidification; phase-field model
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Wang, K.; Wei, M.; Zhang, L. Anomalous Halo Formation in an Arc-Melted ScNi-Sc2Ni Off-Eutectic Binary Alloy. Materials 2016, 9, 584.

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