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Transient creep behaviour of Ni3Al polycrystals

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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.

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Acknowledgment

The authors wish to acknowledge stimulating discussions with D. Caillard, J. Bonneville and P. Spätig. They are grateful to the Swiss National Science Foundation for the financial support.

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Authors and Affiliations

  1. Département de Physique, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH, 1015, Lausanne, Switzerland

    Tomas Kruml, Birgit Lo Piccolo & Jean-Luc Martin

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  1. Tomas Kruml
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  2. Birgit Lo Piccolo
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  3. Jean-Luc Martin
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Kruml, T., Piccolo, B.L. & Martin, JL. Transient creep behaviour of Ni3Al polycrystals. MRS Online Proceedings Library 646, 294–299 (2000). https://doi.org/10.1557/PROC-646-N5.13.1

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  • DOI: https://doi.org/10.1557/PROC-646-N5.13.1

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