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Time-Resolved X-ray Scattering Investigation of Ordering Kinetics in Fe3Ai

Published online by Cambridge University Press:  26 February 2011

B. Park ,
G. B. Stephenson ,
K. F. Ludwig Jr.  and
S. M. Allen
B. Park
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, NY 10598
G. B. Stephenson
Affiliation:
IBM T. J. Watson Research Center, Yorktown Heights, NY 10598
K. F. Ludwig Jr.
Affiliation:
Boston University, Boston, MA 02215
S. M. Allen
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

We have investigated the kinetics of the B2/DO3 transition in Fe3AI (28 at. %) using in situ time-resolved x-ray scattering. In these experiments, the evolution of the diffuse and/or Bragg intensity near the (½ ½ ½) DO3 superlattice peak is observed after the temperature of the sample is abruptly changed. H-ere we present results for the kinetics of re-equilibration of short-range order within the disordered (B2) phase, and of short- and long-range order within the ordered (DO3) phase. The short-range order is characterized by the diffuse peak intensity IDIFFUSE and correlation length ξ;the long-range order is characterized by the Bragg intensity IBRAGG. For quenches within the disordered phase, IDIFFUSE and ξ both relax exponentially at the same rate. The temperature dependence of the relaxation time shows evidence of a divergence at the critical temperature. For shallow quenches within the ordered phase, IBRAGG, IDIFFUSE and ξ all relax exponentially, but with different rates. However, for deep quenches within the ordered phase, IDIFFUSE and ξ do not show simple exponential relaxation. Instead, coarsening of short-range order into long-range order is seen, as in quenches from the disordered phase into the ordered phase. Investigation of up-quenches and down-quenches to the same temperature within the ordered phase indicates that disordering is faster than ordering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 119
Copyright
Copyright © Materials Research Society 1992

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References

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