SYMPOSIA PAPER Published: 01 January 2002
STP11420S

The Effect of Small Concentrations of Sulfur on the Plasticity of Zirconium Alloys at Intermediate Temperatures

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The effect of the addition of some ten ppm sulfur to α-zirconium and Zr-l%Nb-0.13%O alloy is investigated. A strong hardening effect is demonstrated. The hardening effect appears at about 100°C and is maximal around 400°C. Based on creep and constant strain-rate tests, and scanning electron microscopy and transmission electron microscopy observations, it is concluded that sulfur modifies the deformation kinetics, with no change in the deformation mechanisms. The sulfur effect is viscous-like. The screening of all the potential controlling mechanisms allows us to postulate a sulfur segregation involving modifications of the dislocation core structure and then of the dislocation mobility. Ab initio simulations are consistent with this hypothesis.

Author Information

Ferrer, F
CESMAN-DCN, Indret, La Montagne, France
Barbu, A
Laboratoire des Solides Irradiés, Ecole Polytechnique, Palaiseau, France
Bretheau, T
Laboratoire de Mécanique des Solides, Ecole Polytechnique, Palaiseau, France
Crépin, J
Laboratoire de Mécanique des Solides, Ecole Polytechnique, Palaiseau, France
Willaime, F
Service de Recherches de Métallurgie Physique, CEA/Saclay, Gif/Yvette, France
Charquet, D
Cézus Framatome ANP, Centre de Recherche d'Ugine, Ugine, France
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Details
Developed by Committee: B10
Pages: 863–887
DOI: 10.1520/STP11420S
ISBN-EB: 978-0-8031-5468-1
ISBN-13: 978-0-8031-2895-8