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Growth Characteristics of Hydride for Aging Treated U-5.5wt.%Nb Alloy

The hydriding behavior of as-quenched U-5.5Nb alloy followed by 400 °C×3h aging treatment has been studied at 100 °C with the hydrogen pressure specially chosen at 1.0 bar. The pitting and initial growth of hydride was in-situ monitored by hot stage microscope. The morphology and positions of hydrides on sample surface were then carefully studied by the laser scanning confocal microscope (LSCM) and scanning electron microscope (SEM) which were also applied for investigating the microstructure changes before and after the aging treatment. It is clearly found that the acicular phase all over the metal matrix caused by the 400 °C, 3 hr heat-treatment determined the preferential growth of the hydride in specific directions.