Abstract
Zr-Sn-Nb-Fe-Mo alloys are heat treated at two different temperatures (480 and 550 °C). A better corrosion resistance is obtained when annealed at 550 °C. The lower oxidation rate is attributed to the reduction of oxide grain boundary area, as the grain boundaries are the most common short-circuiting paths for oxygen diffusion. Two mechanisms are responsible for crack formation in the oxide: phase transition from tetragonal to monoclinic and delayed oxidation of precipitates. The cracks are generated continuously and linked together to form long cracks, leading to the delamination of oxide films and stress relaxation in the oxide.
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