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Direct Measurement of Dislocation Exhaustion Rates During Plastic Deformation of Ni3Al Compounds

Published online by Cambridge University Press:  10 February 2011

B. Matterstock ,
J. L. Martin ,
J. Bonneville  and
T. Kruml
B. Matterstock
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)
J. Bonneville
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de Génie Atomique, Département de Physique, 1015 Lausanne (Switzerland)
T. Kruml
Affiliation:
Institute of Physics of Materials, Zizkova 22, 616 62 Brno (Czech Republic)
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Abstract

Two methods of repeated transients (stress relaxation and creep) which can be performed during straining at a constant strain rate are recalled together with the way the results are interpreted. The repeated creep method has been adapted to Ni3A1 compounds for which the amount of creep strain during the second creep could not be detected so far. Because of a small stress increase between creeps, it is possible to measure microscopic activation volumes, dislocation exhaustion rates and strain hardening coefficients. Results in Ni3A1 polycrystals and Ni3(AI,Hf) single crystals are presented. Orders of magnitude of dislocation exhaustion rates are given. They are particularly high in Ni3A1 as compared with other materials. They compare well with the work hardening coefficient and with total dislocation densities measured by electron microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.17.1
Copyright
Copyright © Materials Research Society 1999

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References

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