Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-503-C7-507
Oxidation processes in zircaloyD. PÊCHEUR, E. LEFEBVRE and C. LEMAIGNAN
CEA/CEN Grenoble, DTP/SECC, 85X, 38041 Grenoble cedex, France
A study by transmission electron microscopy has been made of the incorporation and oxidation of intermetallic precipitates Zr(Cr,Fe)2 into the uniform oxide layer of Zircaloy-4. The main results are : • most of the precipitates are incorporated unoxidized into the oxide layer and are later oxidized. • iron concentration evolves significantly during oxidation, especially before the transition, segregating to the precipitate-matrix interface, occasionally as metallic iron, before being dissolved in the matrix. The behavior of the precipitates during oxidation is discussed in the light of previous work and possible consequences to the oxidation process are considered.
© EDP Sciences 1993