Numéro
J. Phys. IV France
Volume 03, Numéro C7, Novembre 1993
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
Page(s) C7-519 - C7-522
DOI http://dx.doi.org/10.1051/jp4:1993783
The 3rd European Conference on Advanced Materials and Processes
Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés

J. Phys. IV France 03 (1993) C7-519-C7-522

DOI: 10.1051/jp4:1993783

Microstructural evolution of α or β quenched zirconium alloys during isothermal agings, between 20 °C and 750 °C

P. MERLE, K. LOUCIF and R. BORRELLY

Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux, URA 341, Bat. 502, INSA, 69621 Villeurbanne cedex, France


Abstract
In Zircaloy and zirconium alloys, after quench from the upper limit of the α domain a small quantity of iron, chromium or nickel remains in solid solution and then precipitates during further isothermal aging. This precipitation is studied between 450°C and 600°C, using thermoelectric power (TEP) and resistivity measurements. It is shown that precipitation kinetic is strongly reduced by the presence of oxygen and tin. After quench from the β domain (1030°C) five stages of evolution are detected by TEP measurements in Zircaloy-4, the more important being : - a low temperature evolution (<400°C) attributed to local atomic rearrangements - the precipitation of iron and chromium initially dissolved. The amplitude of TEP variation shows that β quench do not permit to allow larger amount of iron and chromium in solution tha for α quench - the recrystallization of the initial martensitic structure.



© EDP Sciences 1993