Observations on the zirconium hydride precipitation and distribution in zircaloy-4
No Thumbnail Available
Date
2014-05-14
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Link
Abstract
Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron
tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered
diffraction techniques. The precipitated hydride platelet (d-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111}d-ZrH1.66//(0001)a-Zr with the surrounding a-Zr
matrix. The microstructural characterization indicated that hydrides with a relatively uniform
distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense
hydride layer near the surface. Further, the neutron tomography investigations clearly
identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially
formed on the sample surface, and the concentrated hydrides precipitating at the edges/corner of the sample were observed. The causes for the localized hydride accumulation werealso discussed. © 2014, The Minerals, Metals & Materials Society and ASM International 2013.
Description
Keywords
Hydrides, Zircaloy, Electron microscopy, Hydrogen, Neutrons, Spatial distribution
Citation
Wang, Z., Garbe, U., Li, H., Harrison, R. P., Kaestner, A., & Lehmann, E. (2014). Observations on the zirconium hydride precipitation and distribution in zircaloy-4. Metallurgical and Materials Transactions B, 45(2), 532-539. doi:10.1007/s11663-013-9866-0