Thermal expansion behavior of δ-zirconium hydrides: Comparison of δ hydride powder and platelets

Journal Article · Tue Jul 24 00:00:00 EDT 2018 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2018.07.026· OSTI ID:1462875

Cinbiz, Mahmut N.  ^[1]; Hu, Xunxiang  ^[1]; Terrani, Kurt A.  ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The thermal expansion coefficient of δ hydrides and the evolution of the d-spacing of δ hydride platelets in Zircaloy-4 during heat treatments were investigated by conducting synchrotron x-ray diffraction experiments. Identical experiments enabled a direct comparison of the d-spacing of δ zirconium hydride platelets with the d-spacing of the powder δ hydrides. By analyzing the experimental data of this study and the data available in the literature, the thermal expansion coefficient of pure δ hydrides was determined as 14.1 10^-6 °C^-1. Finally, a direct comparison of the d-spacings of δ hydride platelets in CWSR Zry-4 sheet and the powder δ hydride samples showed an evolution of temperature-dependent strains within the δ hydride precipitates in which the strain components normal to the platelet edges exceed that normal to the platelet face during cooling/precipitation but not during heating/dissolution above approx. 200 °C.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• Grant/Contract Number: AC05-00OR22725; 17-13708
• OSTI ID: 1462875
• Alternate ID(s): OSTI ID: 1691646
• Journal Information: Journal of Nuclear Materials, Vol. 509, Issue C; ISSN 0022-3115
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Zirconium hydrides
Thermal expansion coefficient
Lattice parameter
δ hydrides
Synchrotron radiation
Mechanical strain
Dissolution and precipitation