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An Assessment of the Method Used to Determine Activation Parameters in L12 Alloys

Published online by Cambridge University Press:  10 February 2011

B. Matterstock ,
G. Saada ,
J. Bonneville  and
J. L Martin
B. Matterstock
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland)
G. Saada
Affiliation:
Laboratoire d'Etude des Microstructures, CNRS-ONERA, BP 72, 92322 Châtillon Cedex (France)
J. Bonneville
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland)
J. L Martin
Affiliation:
Ecole Polytechnique Fédérale Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland)
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Abstract

The characterisation of dislocation mechanisms in connection with macroscopic mechanical properties are usually performed through transient tests, such as strain-rate jumps, load relaxations or creep experiments. The present paper includes a careful and complete theoretical analysis of the relaxation and the creep kinetics. We experimentally show that the plastic strain-rate is continuous at the transition between constant strain-rate conditions and both load relaxation and creep test. The product of the plastic strain-rate at the onset of the transient test () with the characteristic time (tk) of the transient is found to be independent of , as theoretically expected. This is a clear indication that the assumptions underlying the theoretical analysis are relevant.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK9.12.1
Copyright
Copyright © Materials Research Society 1999

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References

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