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to appear in Solidification Processes and Microstructures : a Symposium in Honor to Wiflried Kurz Eds. M. Rappaz et al. (TMS, Warrendale, PA), in press (2004)
 

Summary: to appear in Solidification Processes and Microstructures : a Symposium in Honor to Wiflried Kurz
Eds. M. Rappaz et al. (TMS, Warrendale, PA), in press (2004)
TESTS OF THEORIES FOR NONPLANAR GROWTH DURING RAPID
ALLOY SOLIDIFICATION
Michael J. Aziz
Division of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge,
MA, 02138, USA
Keywords: Rapid Solidification, Dendritic Growth, Cellular Growth, Interface Kinetics
Abstract
During rapid solidification, kinetically suppressed solute partitioning at the crystal/melt
interface, as well as kinetic interfacial undercooling, become important. Both of these effects
have significant stabilizing influences on a planar interface during rapid solidification. We
review experimental tests we have performed of models for the transition from planar to
cellular growth, and for the velocity-undercooling function of the dendrite tip, in the velocity
regime where nonequilibrium interface kinetics are important.
Introduction
The phase selection, growth velocity, chemical composition, long-range order, and
microstructure of a solidifying phase or phases are functions of the local conditions at the
solid/liquid interface, e.g., temperature, composition, orientation, curvature, and crystal
structure. Our research has been aimed at illuminating how the kinetics of atom movements

  

Source: Aziz, Michael J.- School of Engineering and Applied Sciences, Harvard University

 

Collections: Physics; Materials Science