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Multi-Modal “Order-Order” Kinetics in Ni3Al Studied by Monte Carlo Computer Simulation

Published online by Cambridge University Press:  21 March 2011

P. Oramus ,
R. Kozubski ,
V. Pierron-Bohnes ,
M.C. Cadeville  and
W. Pfeiler
P. Oramus
Affiliation:
Institute of Physics, Jagellonian University, Reymonta 4, 30–059 Kraków, Poland.
R. Kozubski
Affiliation:
Institute of Physics, Jagellonian University, Reymonta 4, 30–059 Kraków, Poland.
V. Pierron-Bohnes
Affiliation:
Institut de Physique et Chimie des Matériaux de Strasbourg, 23, rue du Loess, 67037 Strasbourg, France.
M.C. Cadeville
Affiliation:
Institut de Physique et Chimie des Matériaux de Strasbourg, 23, rue du Loess, 67037 Strasbourg, France.
W. Pfeiler
Affiliation:
Institut für Materialphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria.
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Abstract

“Order-order” relaxations in γ-Ni3Al previously extensively studied by means of resistometry, are simulated within a model of vacancy mechanism of atomic migration in a superstructure implemented with Monte Carlo technique and the Glauber algorithm. The observed operation of two simultaneous relaxation processes showing different rates, as well as the theoretically predicted effect of vacancy ordering have been definitely reproduced and analysed in detail in terms of the dynamics of particular kinds of atomic jumps. The proposed model scenario for the creation and elimination of antisite atoms in the relaxing L12-type superstructure shows that the experimentally observed features of the “order-order” processes in Ni3Al follow from an interplay between two dominating and coupled modes of long- and short-range ordering: the creation/elimination of nn pairs of antisites (SRO) and the change of the “overall” number of antisites (LRO). High profile of the first process results in a high contribution of the fast component of LRO kinetics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.10.1
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

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