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Ordering and disordering in anisotropic L10-FePd

Published online by Cambridge University Press:  11 February 2011

A. Kulovits ,
W. A. Soffa ,
W. Püschl  and
W. Pfeiler
A. Kulovits
Affiliation:
Institut für Materialphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
W. A. Soffa
Affiliation:
Dept. of Materials Science and Engineering, University of Pittsburgh, 842 Benedum Hall, Pittsburgh, PA 15261, U.S.A.
W. Püschl
Affiliation:
Institut für Materialphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
W. Pfeiler
Affiliation:
Institut für Materialphysik, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria
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Abstract

Nearly equiatomic FePd (Fe-52at.%Pd) alloys have been deformed by cold-rolling to 60% thickness reduction. Ordering and disordering was studied during isochronal and isothermal annealing by residual resistometry (REST) in the deformed as well as in the recrystallized state. In both cases a first order phase transition with a broad thermal hysteresis is observed. Resistivity values corresponding to thermal equilibrium of LRO-states, however, result lower in the deformed case. This is interpreted as a consequence of internal stresses leading to a preference of one variant of ordered domains and consequently to a higher degree of LRO.

A detailed study by an isothermal small-step annealing treatment yields two counteracting exponential processes during order-order relaxation with an activation energy of 2.7eV and 2.4eV, respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.37
Copyright
Copyright © Materials Research Society 2003

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References

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