Abstract
This paper mainly concerns phase analysis of hydride blister and phase transformation at elevated temperature with Zircaloy-4 cladding. With electron diffraction patterns from the blister sample, single δ phase hydride is selected, especially, to investigate the phase transformation of δ-hydride with TEM. Under the rapid cooling condition, single δ-hydride transforms to heterogeneous ultrafine lamellar-like structure with the δ and γ-hydride phases. However, the phase transformation from δ-hydride to γ-hydride has not been reported around δ-phase domain in the Zr-H phase diagram, and thus, we suggest that the γ-hydride is able to be generated in the δ phase domain as well as in the α+δ phase domain. It is also proven that the γ phase tends to transform to the stable δ phase with sufficient holding time at the elevated temperature during in-situ TEM experiment.
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