Influence of tiny amounts of impurity on dendritic growth in undercooled melts

O V Kazak,D V Alexandrov,P K Galenko

doi:10.1088/1757-899x/192/1/012030

O V Kazak, D V Alexandrov + Show 1 more

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https://doi.org/10.1088/1757-899x/192/1/012030

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Abstract

An influence of small amounts of impurity on the dendrite growth is investigated analytically and numerically. For investigations, a model for anisotropic dendrites rapidly growing in pure and binary melts is used. The dependence of the dendrite growth velocity and of the dendrite tip radius from undercooled melt from amounts of impurity is analyzed. Calculations are carried out for the pure nickel and binary nickel-zircon diluted melts.

Highlights

Crystallisation process is one of the most important phase transformations in industrial production
The present work is devoted to the kinetics of dendritic growth from an undercooled pure nickel melt in comparison with the dendrite growth kinetics in highly diluted and diluted nickel-zircon melts
In the LKT/BCT model of dendrite growth [4, 5], this phenomenon is introduced by the solute partitioning function k(V ) which adopts interfacial diffusion speed VDI as a kinetic parameter of rapid solidification [6]

Summary

Introduction

Crystallisation process is one of the most important phase transformations in industrial production. Solidification of undercooled Ni-Zr alloys has been investigated in [1,2] at small concentrations of Zr using dendritic growth velocities V measured in Ref.

Results

Conclusion