Atomic scale analysis of grain boundary deuteride growth front in Zircaloy-4

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 xi 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. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.