Abstract
In order to elucidate the phase diagram of the zirconium-hydrogen system at high hydrogen contents, a pressure-composition-temperature study in the temperature range 500° to 850° ? was carried out. From the isotherms obtained in this investigation, the position of the boundary between the two-phase (β+ δ) region and the single phase δ region was more precisely defined (β designates the hydrogen stabilized high temperature zirconium phase, and δ, the cubic hydride phase). The isotherms also showed the existence of a two-phase hydride region (cubic and tetragonal hydride co-existing) at elevated temperatures as has been observed at room temperature.
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