Abstract
The characteristics of zirconium hydrides formed by the electrochemical hydrogen charging method and their effect on the mechanical properties of Zr–Sn–Fe–Nb tubes were investigated. The hydrides were observed to be mostly circumferentially oriented and were identified as ϵ-ZrH2 and γ-ZrH phases by X-ray diffraction. The distribution of hydrides was found to become more homogeneous when the cooling rate was higher from 400°C. The room temperature strength of Zr–Sn–Fe–Nb tubes increased slightly and the ductility decreased with the formation of the hydrides. The mechanical properties were slightly modified by the size and distribution of hydrides. Secondary cracks along the platelets of hydrides were observed on the fracture surfaces of tubes. The slight loss of ductility in the presence of circumferential hydrides is thought to be associated with the secondary cracking during the final process of the fracture.
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