Abstract
Dimensional changes during neutron irradiation of crystallographically textured Zircaloy-2 has been found to be a complex function of its thermal and mechanical treatments. A model is presented here to investigate the influence of intergranular constraints on the irradiation-induced growth. Good qualitative agreement has been obtained with experimental data for dimensional changes observed in unstressed material, in that, (a) the normal anisotropy of growth, resulting from expansion along 〈 a〉 axes and contraction along 〈 c〉 axes can be reversed by prestrain, (b) annealing can introduce intergranular stresses due to the anisotropic thermal expansion, which result in a wider variety of dimensional behaviours than expected from crystallographic texture only, and (c) the intergranular stresses from prestrain are gradually relaxed during irradiation and normal anisotropy eventually returns.
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