Abstract
Irradiation growth has hitherto been considered as a shape change at constant volume; however the apparent absence of suitably oriented sinks for the point defects puts this original assumption in question. Accurate density measurements on cold-worked and annealed Zircaloy-2 irradiated to 2 × 10 25 n/m 2 at 573 K have all indicated a significant volume increase (−0.1%) occurring during irradiation growth. The results are analysed in terms of the prevailing texture ( a- pole distribution ) to yield an anisotropic swelling due to the almost unique (11–20) type Burgers vector for the dominant dislocation sink. Analysis of the macroscopic growth strains in conjunction with the present volume changes allows the shape and volumetric strain components in the three principal directions to be calculated. It is proposed that the increase in volume occurs during the formation of depleted zones up to a steady state concentration.
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