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The Critical Stress for Plastic Deformation in Ni3(Al,Hf) Single Crystals.

Published online by Cambridge University Press:  01 January 1992

P. Spätig ,
J. Bonneville  and
J-L. Martin
P. Spätig
Affiliation:
Ecole Polytechnique Fèdèrale de Lausanne, Institut de Gènie Atomique, Dèpartement de Physique, 1015 Lousanne, (Switzerland)
J. Bonneville
Affiliation:
Ecole Polytechnique Fèdèrale de Lausanne, Institut de Gènie Atomique, Dèpartement de Physique, 1015 Lousanne, (Switzerland)
J-L. Martin
Affiliation:
Ecole Polytechnique Fèdèrale de Lausanne, Institut de Gènie Atomique, Dèpartement de Physique, 1015 Lousanne, (Switzerland)
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Abstract

A new method of relaxation series is proposed which allows for the measurement of the apparent activation volumes and of the hardening correction terms. This method is successfully applied to the measurement of the effective activation volumes along the stress strain curves. A transition stress between a microplastic and a macroplastic domain can be unambiguously defined on the plots of the effective volume as a function of strain. The corresponding transition stress measured at three temperatures in the range of the flow stress anomaly (293K, 423K, 573K), agrees reasonably well with the values of τ0.2%. The latter stress was usually considered as the critical stress for plastic deformation, in former studies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 429
Copyright
Copyright © Materials Research Society 1995

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References

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