TY - JOUR
T1 - Hydride precipitation kinetics in Zircaloy-4 studied using synchrotron X-ray diffraction
AU - Courty, Olivier F.
AU - Motta, Arthur T.
AU - Piotrowski, Christopher J.
AU - Almer, Jonathan D.
N1 - Funding Information:
This research was funded by the U.S. Department of Energy Nuclear Energy University Programs (NEUP) Project 11-2987 . We thank Jun Park and the APS staff for their help in performing the experiments, and Mark Daymond for providing the Rawplot program and the Ceria files used in the analysis. We thank Donald Koss for helpful discussions and the Penn State Nanofab staff for their help in the preparation of the samples. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-06CH11357 .
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/6
Y1 - 2015/6
N2 - As a result of in-reactor corrosion during operation in nuclear reactors, hydrogen can enter the zirconium fuel cladding and precipitate as brittle hydride particles, which may reduce cladding ductility. Dissolved hydrogen responds to temperature gradients, resulting in transport and precipitation into cold spots so that the distribution of hydrides in the cladding is inhomogeneous. The hydrogen precipitation kinetics plays a strong role in the spatial distribution of the hydrides in the cladding. The precipitation rate is normally described as proportional to the supersaturation of hydrogen in solid solution. The proportionality constant, α2, for hydride precipitation in Zircaloy-4 is measured directly using in situ synchrotron X-Ray diffraction, at different temperatures and with three different initial hydrogen concentrations. The results validate the linear approximation of the phenomenological model and a near constant value of α2 = 4.5 × 10-4 s-1 was determined for the temperature range studied.
AB - As a result of in-reactor corrosion during operation in nuclear reactors, hydrogen can enter the zirconium fuel cladding and precipitate as brittle hydride particles, which may reduce cladding ductility. Dissolved hydrogen responds to temperature gradients, resulting in transport and precipitation into cold spots so that the distribution of hydrides in the cladding is inhomogeneous. The hydrogen precipitation kinetics plays a strong role in the spatial distribution of the hydrides in the cladding. The precipitation rate is normally described as proportional to the supersaturation of hydrogen in solid solution. The proportionality constant, α2, for hydride precipitation in Zircaloy-4 is measured directly using in situ synchrotron X-Ray diffraction, at different temperatures and with three different initial hydrogen concentrations. The results validate the linear approximation of the phenomenological model and a near constant value of α2 = 4.5 × 10-4 s-1 was determined for the temperature range studied.
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U2 - 10.1016/j.jnucmat.2015.02.035
DO - 10.1016/j.jnucmat.2015.02.035
M3 - Article
AN - SCOPUS:84925337329
VL - 461
SP - 180
EP - 185
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
ER -