Nonplanar interface morphologies during unidirectional solidification of a binary alloy

Abstract During directional solidification of a binary alloy, a planar solid-liquid interface may become unstable and develop into a cellular non-planar interface, exhibiting periodic structure transverse to the growth direction. Steady state two-dimensional temperature, solute concentration, and interface shapes are calculated numerically and the solute inhomogeneity (microsegregation) in the solidified material obtained. Specific results are presented for an aluminum alloy containing silver for solidification velocities of 0.01 and 1.0 cm/s, which correspond to the constitutional supercooling and absolute stability regimes, respectively.

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