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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

1. Ludwig, K. F. Jr., Stephenson, G. B., Jordan-Sweet, J. L., Mainville, J., Yang, Y. S., and Sutton, M., Phys. Rev. Lett. 61, 1859 (1988).CrossRefGoogle Scholar
2. Okamoto, H. and Beck, P. A., Metall. Trans. 2, 569 (1971).CrossRefGoogle Scholar
3. Allen, S. M. and Cahn, J. W., Acta Metall. 27, 1085 (1979).CrossRefGoogle Scholar
4. Stephenson, G. B., Nucl. Instrum. Methods Phys. Res. A 266, 447 (1988).CrossRefGoogle Scholar
5. Stephenson, G. B., Ludwig, K. F. Jr., Jordan-Sweet, J. L., Brauer, S., Mainville, J., Yang, Y. S. M. Google Scholar