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Kinetic paths of B2 and DO3 order parameters: Experiment

Published online by Cambridge University Press:  31 January 2011

L. Anthony  and
B. Fultz
L. Anthony
Affiliation:
Department of Materials Science 138-78. California Institute of Technology, Pasadena, California 91125
B. Fultz
Affiliation:
Department of Materials Science 138-78. California Institute of Technology, Pasadena, California 91125
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Abstract

Rapidly quenched powders of Fe3Al were subjected to thermal annealings at temperatures well below the critical temperatures for B2 and DO3 ordering. X-ray diffractometry was used to measure the subsequent evolution of B2 and DO3 long-range order. It was found that the relative rates of change of B2 and DO3 order parameters were temperature dependent; hence at different temperatures the alloy passed through different states of order en route to thermal equilibrium. These temperature dependences of “kinetic paths” can be understood in terms of a theory of kinetic paths based on the kinetic master equation. The theory indicates that the temperature dependence of the observed kinetic paths originates from having first-nearest-neighbor interactions that are stronger than second-nearest-neighbor interactions. This seems consistent with previous thermodynamic analyses of critical temperatures of Fe3Al.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 5 , October 1989 , pp. 1140 - 1142
Copyright
Copyright © Materials Research Society 1989

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References

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