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Transient creep behaviour of Ni3Al polycrystals

Published online by Cambridge University Press:  21 March 2011

Tomas Kruml ,
Birgit Lo Piccolo  and
Jean-Luc Martin
Tomas Kruml
Affiliation:
Département de Physique, Ecole Polytechnique Fédérale de Lausanne (EPFL) CH 1015 Lausanne, SWITZERLAND
Birgit Lo Piccolo
Affiliation:
Département de Physique, Ecole Polytechnique Fédérale de Lausanne (EPFL) CH 1015 Lausanne, SWITZERLAND
Jean-Luc Martin
Affiliation:
Département de Physique, Ecole Polytechnique Fédérale de Lausanne (EPFL) CH 1015 Lausanne, SWITZERLAND
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Abstract

Repeated creep tests were used for measuring various constant strain-rate deformation parameters. The results are consistent with those of repeated stress relaxations, although the precision is lower for creep in the present case. The small yield point observed in reloading after the transient is directly related to the amount of exhausted mobile dislocations, i.e. it originates from multiplication processes. During the transient test (180s total), the total exhaustion rate of mobile dislocations can be as high as 99%. It exhibits a maximum at the same T (about 500 K) as the work hardening. This supports the validity of a model which considers the work-hardening peak temperature to correspond to the stress under which incomplete Kear-Wilsdorf locks yield.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.13.1
Copyright
Copyright © Materials Research Society 2001

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References

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