SYMPOSIA PAPER Published: 01 February 2018
STP159720160044

Effect of Irradiation on Terminal Solid Solubility of Hydrogen in Zr-2.5Nb

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Knowledge of the temperature dependence of hydrogen solubility is used to define the conditions necessary for brittle hydrides to be present in reactor components during service. The terminal solid solubility (TSS) of hydrogen is affected by several factors, including irradiation, cold work, and decomposition of the β phase in Zr-2.5Nb. TSS temperatures for specimens irradiated in Osiris, Halden, and CANDU® reactors are reported. TSS was measured on Zr-2.5Nb specimens using differential scanning calorimetry (DSC) to complete four heat-up/cool-down cycles (heat to a peak temperature and cool to room temperature at a rate of 10°C/min) followed by a 1-h anneal at 500°C, and then four more heat-up/cool-down cycles. As with Zircaloy, irradiation slightly decreases the TSS temperatures, but subsequent annealing increases them. These changes are attributed to an initial effect of irradiation damage and reconstitution of the β phase and reversal of these effects by annealing, as indicated by X-ray diffraction data showing reduced dislocation density and higher β-phase volume fraction after the specimens were annealed.

Author Information

Nordin, Heidi, M.
Canadian Nuclear Laboratories, 286 Plant Rd., Chalk River Laboratories, Ontario, CA
Hilton, Vicky
Canadian Nuclear Laboratories, 286 Plant Rd., Chalk River Laboratories, Ontario, CA
Buyers, Andrew, W.
Canadian Nuclear Laboratories, 286 Plant Rd., Chalk River Laboratories, Ontario, CA
Coleman, Christopher, E.
Canadian Nuclear Laboratories, 286 Plant Rd., Chalk River Laboratories, Ontario, CA
McRae, Glenn, A.
Carleton University, Dept. of Mechanical and Aerospace Engineering, Ottawa, CA
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Developed by Committee: B10
Pages: 1136–1166
DOI: 10.1520/STP159720160044
ISBN-EB: 978-0-8031-7642-3
ISBN-13: 978-0-8031-7641-6