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

Silvère Akamatsu (1, 2) , Sabine Bottin-Rousseau (1, 2) , Gabriel Faivre (1, 2) , Efim A Brener (1, 3)

1 INSP-E6 - Physico-chimie et dynamique des surfaces
2 INSP - Institut des Nanosciences de Paris
3 Peter Grünberg Institute

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).

Domaines: Matière Condensée [cond-mat]

Silvère Akamatsu, Sabine Bottin-Rousseau, Gabriel Faivre, Efim A Brener. Scaling Theory of Two-Phase Dendritic Growth in Undercooled Ternary Melts. Physical Review Letters, 2014, 112, pp.105502. ⟨10.1103/PhysRevLett.112.105502⟩. ⟨hal-01472466⟩