Influence of diffusion and convective transport on dendritic growth in dilute alloysExperimentation 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 percent). This system is especially useful as a model for alloy studies because kinetic data are available for high purity (7-9's) succinonitrile. The influence of the solute, at fixed thermal supercooling, is to increase the growth velocity and correspondingly decrease intrinsic crystal dimensions. Morphological measurements are described in detail relating tip size, perturbation wavelength, supercooling, and solute concentration. The analysis of these effects based on morphological stability theory is also discussed, and experiments permitting the separation of convective and diffusive heat transport during crystal growth of succinonitrile are described. The studies underscore the importance of gravitationally-induced buoyancy effects on crystal growth.
Document ID
19830062080
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Glicksman, M. E. (Rensselaer Polytechnic Inst. Troy, NY, United States)
Singh, N. B. (Rensselaer Polytechnic Inst. Troy, NY, United States)
Chopra, M. (Rensselaer Polytechnic Institute, Troy, NY, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
Solid-State Physics
Meeting Information
Meeting: Materials processing in the reduced gravity environment of space; Annual Meeting