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Contribution of the back-diffusion phenomenon to microsegregation of solute for dendritic and cellular growth.

Wołczyńska W., Kloch J.

Inżynieria Materiałowa

1998

R. XIX, nr 3

532-535

New method for the estimation of solute redistribution in dendritic and cellular growth after back diffusion is developed. The redistribution depends on partition ratio kappa and back-diffusion parameter alpha known in Brody-Flemings theory. A definition for the redistribution coefficient beta is worked out. It enables to satisfy the mass balance at each stage of cellular or dendritic growth. The redistribution coefficient beta operates to increase the value of partition ratio kappa. The model is reducible to both Scheil approach and equilibrium solidification (lever rule). Physical justification for the back-diffusion parameter alpha is given. A modification of the definition for back-diffusion parameter is proposed to apply it to experimental measurements.