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Abstract
Reactor-grade zirconium specimens containing from 50 to 640 ppm hydrogen have been cooled from solution-treatment temperatures at different rates by water-quenching, oil-quenching, air-cooling and furnace-cooling. Optical and electron metallography have shown that the average size of the hydrides, the proportion of the hydrides located at grain boundaries, and the proportion of the equilibrium δ-hydride increased as the hydrogen concentration was increased and/or the rate of cooling was decreased. The precipitate distributions and relative amounts of the γ and δ hydrides observed can be explained in terms of nucleation theory.
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