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Dynamics and Atcmic Strujciure of Martemite-Austenite Interfaces :

Published online by Cambridge University Press:  25 February 2011

S. Chen ,
P. C. Clapp  and
J. A. Rifkin
S. Chen
Affiliation:
Center for Materials Simulation, Institute of Materials Science, University of Connecticut, Storrs, Cr 06269–3136, USA
P. C. Clapp
Affiliation:
Center for Materials Simulation, Institute of Materials Science, University of Connecticut, Storrs, Cr 06269–3136, USA
J. A. Rifkin
Affiliation:
Center for Materials Simulation, Institute of Materials Science, University of Connecticut, Storrs, Cr 06269–3136, USA
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Abstract

The structure of the lowest energy interface between an hcp austeidte phase and an foc martensite phase of similar atomic volumes has been simulated by annealing a disordered region between the two perfect lattices until semi-coberent intergrowth occurred. The two structures were oriented so that the closepacked planes were parallel, and closepacked directions were aligned. The dynamics of this interface and the structure which it evolved as it moved was then studied by applying a transformation driving force through the use of an Embedded Atar Method potential. Initially the interface moved in a reconstructive, diffusive manner but eventually it developed a highly mobile, diffusionless form which moved at about one third of the shear sound velocity. The structure of this rapidly moving interface could be analyzed in terms of three different types of Shockley partials arranged in sequence, but passing at slightly different times. This structure agrees with some elements of a model previously proposed by Christian to describe the transformation in pure Co, and agrees with other elements of a proposal of Mcbreer, Lunggren and Franck to explain their observations of the transformation in 4He. Neither fully explain our observations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 65
Copyright
Copyright © Materials Research Society 1992

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References

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