|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Late News Poster Session
||O-27: Synchrotron XRD Hydride Phase Mapping In Zicracloy-2 Cladding
||Aaron Colldeweih, Malgorzata Makowska, Johannes Bertsch
|On-Site Speaker (Planned)
Synchrotron micro-beam X-ray diffraction (µXRD) has been used to map the crystallographic phases throughout the cross-section of Zircaloy-2 cladding where a radial delayed hydride crack (DHC) propagated. The sample cross-sections were prepared with a focused ion beam (FIB) to mill a 10-35 µm thick lamella. The DHC cracks were propagated with a three-point bending test at 100°C, 150°C, and 320°C in unirradiated Zircaloy-2 nuclear fuel cladding, which contained about 201 wppm H. The spatial resolution provides clues to the critically sized hydride specifically at low temperatures. Tests on cladding with an inner liner have shown that a vast majority of hydrogen precipitates within the inner liner directly at the liner-substrate interface. It has been found that the δ- and ɣ-hydride phases constitute the DHC-responsible hydrides at the tip of arrested DHC cracks and that the volume of material occupied by hydrides is notably larger at high temperatures.
||Phase Transformations, Nuclear Materials, Other