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Title: Measurement of Hydride Precipitation and Dissolution Kinetics Using Synchrotron X-Rays

Authors:
; ;  [1];  [2]
  1. (Kinectrics)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1351324
Resource Type:
Conference
Resource Relation:
Conference: ASME 2016 Pressure Vessels and Piping Conference;July 17-21, 2016;Vancouver, Canada
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Shiman, Oksana, Daymond, Mark R., Tulk, Eric, and Queens). Measurement of Hydride Precipitation and Dissolution Kinetics Using Synchrotron X-Rays. United States: N. p., 2017. Web. doi:10.1115/PVP2016-63729.
Shiman, Oksana, Daymond, Mark R., Tulk, Eric, & Queens). Measurement of Hydride Precipitation and Dissolution Kinetics Using Synchrotron X-Rays. United States. doi:10.1115/PVP2016-63729.
Shiman, Oksana, Daymond, Mark R., Tulk, Eric, and Queens). Thu . "Measurement of Hydride Precipitation and Dissolution Kinetics Using Synchrotron X-Rays". United States. doi:10.1115/PVP2016-63729.
@article{osti_1351324,
title = {Measurement of Hydride Precipitation and Dissolution Kinetics Using Synchrotron X-Rays},
author = {Shiman, Oksana and Daymond, Mark R. and Tulk, Eric and Queens)},
abstractNote = {},
doi = {10.1115/PVP2016-63729},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Apr 06 00:00:00 EDT 2017},
month = {Thu Apr 06 00:00:00 EDT 2017}
}

Conference:
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  • 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 directlymore » 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.« less
  • No abstract prepared.
  • A single photon can ionize either one or, less often, both electrons in helium. The frequency with which two electrons are ionized is a strong function of incident photon energy. Further, the fundamental process by which ionization occurs depends on energy. At low energies, photoionization is the fundamental mechanism while Compton ionization dominates at high energies. Some theorists argue that {sigma}++/{sigma}+ should be the same asymptotically for both processes; others observe that photoionization and Compton ionization are fundamentally different and no simple relationship exists. The status of present measurements will be discussed and compared with theory.
  • Strains in thermally grown oxides have been measured in-situ, as the oxides develop and evolve. Extensive data have been acquired from oxides grown in air at elevated temperatures on different model alloys that form Al{sub 2}O{sub 3}. Using synchrotron x-rays at the Advanced Photon Source (Beamline 12BM, Argonne National Laboratory), Debye-Scherrer diffraction patterns from the oxidizing specimen were recorded every 5 minutes during oxidation and subsequent cooling. The diffraction patterns were analyzed to determine strains in the oxides, as well as phase changes and the degree of texture. To study a specimen's response to stress perturbation, the oxidizing temperature wasmore » quickly cooled from 1100 to 950 C to impose a compressive thermal stress in the scale. This paper describes this new experimental approach and gives examples from oxidized {beta}-NiAl, Fe-20Cr-10Al, Fe-28Al-5Cr and H2-annealed Fe-28Al-5Cr (all at. %) alloys to illustrate some current understanding of the development and relaxation of growth stresses in Al{sub 2}O{sub 3}.« less