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

1993 Journal de Physique IV : Proceedings  
In Zircaloy and zirconium alloys, after quench from the upper limit of the a 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 P domain (7030°C) five stages of evolution are detected
more » ... 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 f3 quench do not permit to allow larger amount of iron and chromium in solution tha for a quench the recrystallization of the initial martensitic structure.
doi:10.1051/jp4:1993783 fatcat:nh3hsvcjmbev5jrwzza34ubaii