Abstract
In order to investigate effects of the distribution of intermetallic particles on the SCC of zirconium alloys, SCC tests were carried out on non-irradiated Zircaloy-2 and zirconium which were heat-treated under various conditions. Relatively large particles were randomly dispersed in samples annealed at temperatures in the α-phase domain. Quenching from relatively low temperatures in the (α + β)-phase domain, such as 1148 K, produced the grain boundary segregation of very small particles. Widmanstätten structures were seldom formed by the quenching. The frequency of transgranular cracks increased with the volume fraction of the particles on grain boundaries, while that of intergranular cracks increased with the averaged spacing of grain boundary particles. Not intergranular cracks, but transgranular cracks propagated rapidly enough to cause short time brittle fracture, and SCC susceptibility increased with the volume fraction of grain boundary particles.
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