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Influence of Diffusion and Convective Transport on Dendritic Growth in Dilute Alloys

Published online by Cambridge University Press:  15 February 2011

M. E. Glicksman ,
Narsingh Bahadur Singh  and
M. Chopra
M. E. Glicksman
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York, USA
Narsingh Bahadur Singh
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York, USA
M. Chopra
Affiliation:
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York, USA
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Abstract

Extensive experimentation has been carried out in which the kinetics and morphology of dendritic growth were measured as a function of thermal supercooling, solute concentration, and spatial orientation of the dendritic growth axis. The crystal growth system studied is succinonitrile [NC(CH2)2CN] with additions of argon (up to 0.1 mole %). This system is especially useful as a model for alloy studies because kinetic data are available for high purity (7–9's) succinonitrile. The addition of argon provides a simple, controllable dilute solute that now permits the first comparably detailed dendritic growth studies on binary alloys.

One dramatic influence of the solute, at fixed thermal supercooling, is to increase the growth velocity (to a maximum) and correspondingly decrease intrinsic crystal dimensions (tip radius). Morphological measurements will be described in detail relating tip size, perturbation wavelength, supercooling, and solute concentration. The analysis of these effects based on morphological stability theory will also be discussed. Finally, experiments permitting the separation of convective and diffusive heat transport during crystal growth of succinonitrile will be described briefly. These studies clearly underscore the importance of gravitationally-induced buoyancy effects on crystal growth kinetics and morphology.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 461
Copyright
Copyright © Materials Research Society 1982

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References

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