Abstract
Zirconium oxidized above the α/β transformation temperature and quenched to room temperature, had a needle-like prior-β phase. As prior-β zirconium was known to influence the mechanical properties of the cladding tube during a loss-of-coolant accident (LOCA), the nanochemical properties of prior-β zirconium were studied by nanoindentation tests at room temperature. The nanohardness and the oxygen distribution of prior-β phase have wave undulations whose wavelengths are almost the same as the grain size in the prior-β phase. A grain in the prior-β phase has nanohardness distribution caused by the difference in oxygen concentration.
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