Zirconium hydride precipitation kinetics in Zircaloy-4 observed with synchrotron X-ray diffraction
Article dans une revue avec comité de lecture
JournalJournal of Nuclear Materials
High-energy synchrotron X-ray diffraction was used to investigate the isothermal precipitation of δ-hydride platelets in Zircaloy-4 at a range of temperatures relevant to reactor conditions, during both normal operation and thermal transients. From an examination of the rate kinetics of the precipitation process, precipitation slows with increasing temperature above 200 °C, due to a reduction in the thermodynamic driving force. A model for nucleation rate as a function of temperature was developed, to interpret the precipitation rates seen experimentally. While the strain energy associated with the misfit between hydrides and the matrix makes a significant contribution to the energy barrier for nucleation, a larger contribution arises from the interfacial energy. Diffusion distance calculations show that hydrogen is highly mobile in the considered thermal range and on the scale of inter-hydride spacing and it is not expected to be significantly rate limiting on the precipitation process that takes place under reactor operating conditions.
Files in this item
- PIMM - JNM - BLACKMUR - 2015.pdf
Showing items related by title, author, creator and subject.
Article dans une revue avec comité de lectureMAIMAITIYILI, T.; STEUWER, Axel; BLOMQVIST, Jakob; BJERKÉN, Christina; BLACKMUR, Matthew S.; ZANELLATO, Olivier; ANDRIEUX, Jérôme; RIBEIRO, Fabienne (Wiley-VCH Verlag, 2016)We investigate the formation and dissolution of hydrides in commercially pure zirconium powder in-situ using high-energy synchrotron X-ray radiation. Experimental results showed a continuous phase transition between the δ ...
Article dans une revue avec comité de lectureMAIMAITIYILI, Tuerdi; BLOMQVIST, Jakob; STEUWER, Axel; BJERKEN, Christina; ZANELLATO, Olivier; BLACKMUR, Matthew S; ANDRIEUX, Jérôme; RIBEIRO, Fabienne (International Union of Crystallography, 2015)For the first time, various hydride phases in a zirconium-hydrogen system have been prepared in a high-energy synchrotron X-ray radiation beamline and their transformation behaviour has been studied in situ. First, the ...
Strain evolution during hydride precipitation in Zircaloy-4 observed with synchrotron X-ray diffraction Article dans une revue avec comité de lecturePREUSS, Michael; ROBSON, Joseph D; ZANELLATO, Olivier; CERNIK, Robert J; RIBEIRO, Fabienne; ANDRIEUX, Jérôme (Elsevier, 2016)Synchrotron X-ray diffraction was used to evaluate strain evolution observed in Zircaloy-4 undergoing hydride precipitation during a range of thermal operations. During continuous heating, a change in the constraining ...
Article dans une revue avec comité de lectureMAIMAITIYILIT, Tuerdi; BJERKEN, Christina; STEUWER, Axel; WANG, Z; DANIELS, J; ANDRIEUX, Jérôme; BLOMQVIST, Jakob; ZANELLATO, Olivier (Elsevier, 2017)We report on the measurement of the formation of γ-ZrH during in situ gaseous charging. The measurements were undertaken using high-energy synchrotron X-ray diffraction. Experimental observation shows that γ-ZrH can form ...
Article dans une revue avec comité de lectureRIBEIRO, Pedro; THOMAS, Olivier (American Society of Mechanical Engineers (ASME), 2017)A nonlocal Bernoulli–Euler p-version finite-element (p-FE) is developed to investigate nonlinear modes of vibration and to analyze internal resonances of beams with dimensions of a few nanometers. The time domain equations ...