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

JOURNAL OF NUCLEAR MATERIALS

卷:509

Article

Cinbiz, M. Nedim¹  Hu, Xunxiang¹  Terrani, Kurt¹ 

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

关键词: Zirconium hydrides;    Thermal expansion coefficient;    Lattice parameter;    delta hydrides;    Synchrotron radiation;    Mechanical strain;    Dissolution and precipitation;   

DOI  :  10.1016/j.jnucmat.2018.07.026

来源: Elsevier

【 摘 要 】

The thermal expansion coefficient of delta hydrides and the evolution of the d-spacing of delta 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 delta zirconium hydride platelets with the d-spacing of the powder delta hydrides. By analyzing the experimental data of this study and the data available in the literature, the thermal expansion coefficient of pure delta hydrides was determined as 14.1 10(-6) degrees C-1. A direct comparison of the d-spacings of delta hydride platelets in CWSR Zry-4 sheet and the powder delta hydride samples showed an evolution of temperature-dependent strains within the delta 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 degrees C. Published by Elsevier B.V.

【 授权许可】

Free