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Atomistic Image of the Kinetics of ‘Order-Order’ Reactions in Ni3Al+B

Published online by Cambridge University Press:  21 February 2011

R. Kozubski  and
W. Pfeiler
R. Kozubski
Affiliation:
on leave from Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Krakow, Poland
W. Pfeiler
Affiliation:
Institut für Festkörperphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
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Abstract

Isothermal ‘order-order’ relaxations in Ll2-ordered N76Al24+0.19at.%B were studied by means of residual resistometry. This method made it possible to register very fine changes in the degree of LRO occurring about 1000K below the disordering temperature. The experimental results of two simultaneous processes being involved in these order-order relaxations with a high activation energy of 4.6eV are explained with an atomistic model of atomic jumps to nn vacancies. The parallel processes are connected with selected jumps of atoms to nn vacancies on different sublattices with a high activation energy of vacancy formation being involved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 587
Copyright
Copyright © Materials Research Society 1998

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References

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