Abstract
General expressions are derived for the solubility of hydrogen in equilibrium with internally and externally stressed hydrides. These expressions are applied to some data for the terminal solid solubility (TSS) of hydrogen in zirconium and its alloys to estimate (a) the amount of hydride-matrix misfit strain energy lost to plastic deformation and (b) the amount of undercooling below the constrained TSS needed to initiate hydride nucleation. It is found that about 50% of the total, theoretically estimated misfit strain energy is converted to plasttic deformation energy. This estimate varied little amongst the various TSS data. Undercooling values, on the other hand, showed considerable variation, ranging from about 0 K to 40 K. The analysis implies that the hydrides likely retain some coherency with the matrix and that the undercooling required to overcome the barrier to nucleation contributes, in some cases, significantly to the total shift between the TSS data measured on heating and on cooling.
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