Add time:08/27/2019         Source:sciencedirect.com

The characteristics of hydride phase development in bulk uranium and holmium were studied utilizing metallographic examinations of partially hydrided samples. It has been found that the precipitation of the hydride phase during the reaction with gaseous hydrogen occurs, in the case of uranium, only at the hydride-metal interface while, for holmium, bulk precipitation (of the dihydride) also contributes significantly. The holmium-hydrogen reaction starts with a dissolution stage which proceeds until bulk saturation is reached. Then, intergranular hydride precipitation takes place throughout the bulk with some preference for surface precipitation. The difference in the development of the hydride phase between uranium and holmium was attributed to strain effects associated with the volume expansion which accompanies the hydride formation. Cooling a hydrogen-saturated solid solution of holmium results in the precipitation of an intragranular lamellar form of the hydride.

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