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International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments

Editor
B. P. Somerday
B. P. Somerday
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P. Sofronis
P. Sofronis
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ISBN:
9780791861387
No. of Pages:
800
Publisher:
ASME Press
Publication date:
2017

The fast and spontaneous hydrogen diffusion in zirconium alloys used in the nuclear industry leads to the hydride precipitation which is often pointed as causing embrittlement and rupture. Though XRD, TEM and SEM-EBSD analyses we demonstrate that the nature of hydride phases depends the hydrogen content and can show crystallographic orientation relationships (ORs) with the substrate. DSC has been used to identify the dissolution and precipitation energies at global scale. The difference of both can be associated to the misfit dislocations contribution to the precipitation. These results are confirmed at a local scale by in-situ TEM hydride dissolution. The depinning of some misfit dislocation is observed during the dissolution process, which decreases the number of hydrogen atoms available to reprecipitate.

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