SYMPOSIA PAPER Published: 01 January 2005
STP37502S

Plastic Deformation of Irradiated Zirconium Alloys: TEM Investigations and Micro-Mechanical Modeling

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TEM investigations have been performed on irradiated samples after deformation covering various testing conditions for different recrystallized Zr alloys. It is shown that for transverse tensile tests and internal pressure tests performed at 350°C, only basal channels are observed for strain levels up to uniform elongation, whereas only prismatic and pyramidal channels are observed for axial tensile test. Then, focusing on internal pressure testing, irradiation hardening and strain hardening behavior have been analyzed in detail and compared to TEM observations. It is proposed that dislocation channeling phenomenon leads to high strain incompatibility between channels and surrounding grains and therefore to high microscopic internal stresses. These high microscopic internal stresses are believed to induce strong kinematic hardening at the macroscopic scale, as suggested by the mechanical behavior analysis. Finally, a micro-mechanical model based on microscopic deformation mechanisms and using homogenization techniques is proposed, taking into account the observed channeling phenomenon.

Author Information

Onimus, F
CEA/DEN, Service de Recherches Métallurgiques Appliquées, CEA-Saclay, Gif-sur-Yvette, France
Béchade, J-L
CEA/DEN, Service de Recherches Métallurgiques Appliquées, CEA-Saclay, Gif-sur-Yvette, France
Prioul, C
Ecole Centrale Paris, Laboratoire de Mécanique des Sols, Structures et Matériaux, Châtenay-Malabry, France
Pilvin, P
Université de Bretagne Sud — IUP Lorient, Laboratoire de Génie Mécanique et Matériaux, Lorient, France
Monnet, I
CEA/DEN, Service de Recherches Métallurgiques Appliquées, CEA-Saclay, Gif-sur-Yvette, France
Doriot, S
CEA/DEN, Service de Recherches Métallurgiques Appliquées, CEA-Saclay, Gif-sur-Yvette, France
Verhaeghe, B
CEA/DEN, Service d'Etude des Matériaux Irradiés, CEA-Saclay, Gif-sur-Yvette, France
Gilbon, D
CEA/DEN, Service d'Etude des Matériaux Irradiés, CEA-Saclay, Gif-sur-Yvette, France
Robert, L
Electricité de France, R&D Division, Materials and Mechanics of Components, Les Renardières, Moret sur Loing, France
Legras, L
Electricité de France, R&D Division, Materials and Mechanics of Components, Les Renardières, Moret sur Loing, France
Mardon, J-P
Framatome-ANP Nuclear Fuel, Lyon, France
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Details
Developed by Committee: B10
Pages: 53–78
DOI: 10.1520/STP37502S
ISBN-EB: 978-0-8031-5519-0
ISBN-13: 978-0-8031-3493-5