Atomic scale analysis of grain boundary deuteride growth front in Zircaloy-4
A.J. Breen, I. Mouton, W. Lu, S. Wang, A. Szczepaniak, P. Kontis, L.T., Stephenson, Y. Chang, A.K. da Silva, C. Liebscher, D. Raabe, T.B. Britton, M., Herbig, B. Gault
TL;DR
This study investigates the atomic-scale structure and composition of deuteride growth fronts in Zircaloy-4, revealing phase transformations and element segregation that influence material embrittlement.
Contribution
It provides new atomic-scale insights into deuteride phases, interfaces, and element segregation in Zircaloy-4, advancing understanding of hydride formation mechanisms.
Findings
Identification of HCP -Zr, FCC deuteride, and HCP deuteride phases.
Segregation of Sn to the deuteride/ -Zr interface.
Observation of phase transformations at the deuteride growth front.
Abstract
Zircaloy-4 (Zr-1.5%Sn-0.2%Fe-0.1%Cr wt. %) was electrochemically charged with deuterium to create deuterides and subsequently analysed with atom probe tomography and scanning transmission electron microscopy to understand zirconium hydride formation and embrittlement. At the interface between the hexagonal close packed (HCP) \alpha-Zr matrix and a face centred cubic (FCC) \delta deuteride (ZrD1.5-1.65), a HCP \zeta phase deuteride (ZrD0.25-0.5) has been observed. Furthermore, Sn is rejected from the deuterides and segregates to the deuteride/\alpha-Zr reaction front.
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Taxonomy
TopicsNuclear Materials and Properties · Advanced Materials Characterization Techniques · High Temperature Alloys and Creep