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Activation Volumes in the Yield Strength Anomaly Domain of Ni3(Al,Ta).

Published online by Cambridge University Press:  22 February 2011

P. Spätig ,
J. Bonneville  and
J.-L. Martin
P. Spätig
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne, (Switzerland).
J. Bonneville
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne, (Switzerland).
J.-L. Martin
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne, (Switzerland).
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Abstract

Ni3(Al,Ta) single crystals have been deformed in compression in the temperature range of the flow stress anomaly (293–780K). The strain-rate sensitivity (SRS) of the flow stress has been characterised by using a technique of repeated stress relaxations that allows for the measurement of the true (or effective) activation volume (Veff). When measured at the conventional critical resolved shear stress (CRSS), Veff exhibits as a function of temperature a sharp discontinuity close to 470K. When the temperature is held constant (420K), the discontinuity of Veff occurs along the stress-strain curve at approximately 3% strain; the stress for both discontinuities is approximately the same. These results suggest a change in the rate controlling mechanism that is dependent on stress as much or more than temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 713
Copyright
Copyright © Materials Research Society 1995

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