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Scaling Theory of Two-Phase Dendritic Growth in Undercooled Ternary Melts

Abstract : Two-phase dendrites are needlelike crystals with a eutectic internal structure growing during solidification of ternary alloys. We present a scaling theory of these objects based on Ivantsov’s theory of dendritic growth and the Jackson-Hunt theory of eutectic growth. The additional introduction of the relationship ρ~λ (ρ: dendrite tip radius; λ: eutectic interphase spacing) suggested by recent experimental results [, Phys. Rev. Lett. 104, 056101 (2010)] leads to a complete solution of the selection problem and to the scaling rule ρ~v−1/2 (v: dendrite tip growth rate).
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Silvère Akamatsu, Sabine Bottin-Rousseau, Gabriel Faivre, Efim Brener. Scaling Theory of Two-Phase Dendritic Growth in Undercooled Ternary Melts. Physical Review Letters, American Physical Society, 2014, 112, pp.105502. ⟨10.1103/PhysRevLett.112.105502⟩. ⟨hal-01472466⟩



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