Atomic scale analysis of grain boundary deuteride growth front in Zircaloy-4
cond-mat.mtrl-sci
/ Authors
A. J. Breen, I. Mouton, W. Lu, S. Wang, A. Szczepaniak, P. Kontis, L. T. Stephenson, Y. Chang, A. K. da Silva, C. Liebscher
and 4 more authors
/ 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) α-Zr matrix and a face centred cubic (FCC) δdeuteride (ZrD1.5-1.65), a HCP ζphase deuteride (ZrD0.25-0.5) has been observed. Furthermore, Sn is rejected from the deuterides and segregates to the deuteride/α-Zr reaction front.