Characterization and modeling of creep mechanisms in Zircaloy-4
Abstract
The deformation microstructure and creep mechanisms of Zircaloy-4 have been investigated. Four Zircaloy-4 specimens were tested at different temperatures and stress levels and the deformation microstructures of these specimens were analyzed using transmission electron microscopy. On the basis of microstructural observation of a-type screw dislocations in prismatic slip systems, the modified jogged-screw model has been applied as a rate controlling mechanism for creep of Zircaloy-4. In addition, the stress dependency of dislocation density, jog spacing, and jog height has been evaluated via modeling and experimental observations. The purpose of this study is to provide a detailed understanding of the creep deformation of Zircaloy-4 and prediction of creep rates in this alloy based on the microstructural information obtained from TEM analysis.
- Publication:
-
Journal of Nuclear Materials
- Pub Date:
- July 2006
- DOI:
- 10.1016/j.jnucmat.2006.01.023
- Bibcode:
- 2006JNuM..353..177M