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Absence of solute drag in solidification J. A. Kittl and M. J. Aziz
 

Summary: Absence of solute drag in solidification
J. A. Kittl and M. J. Aziz
lXvisiort of $plitri &:imrq Harvrzrd lJttiversi& Ccttnhridge, h4as.w~hu.wtt.s02.138
D. f? Brunco and M. 0. Thompson
I~q3iwttmxt of Materi& S&ztm aitcl Etigiiteering Cornell University Ithum. Ntw York I#.53
(Received 4 January 1994: accepted for publication 19 February 1994)
The interface response functions for alloy solidification were measured in the nondegenerate regime
of partial solute trapping. We used a new technique to measure temperatures and velocities
simultaneouslv during rapid solidification of Si-As alloys induced by pulsed laser melting. In_I
addition, partition coefficients were determined using Rutherford backscattering. The results are in
good agreement with predictions of the Continuous Growth Model without solute drag of M. J. Aziz
and T. Kaplan [Acta Metall. 36, 1335 (19SS)] and are inconsistent with all solute drag models.
Considerable effort has been devoted to understanding
the growth kin&s of interface-mediated phase transitions.
Rapid alloy solidification is theoretically and experimentally
among the simplest and most-studied cases and serves as a
prototypical growth process. Much of the interface kinetics
work in rapid alloy solidificationrmm3has concentrated on the
interface velocity (v) dependence of solute partitioning for
dilute alloys, studying the transition with increasing 1'from

  

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

 

Collections: Physics; Materials Science