Abstract
Two models of precipitation-dissolution hysteresis in zirconium have been discussed recently. In one an elastic model for the hydrogen flux is written as the superposition of a diffusion current and a drift current. The solvus, TSS, is defined when the currents sum to zero at a hydride interface. Stable hydrides are surrounded by a cloud of hydrogen terminating at concentration C- calculated from another zero-flux condition. The temperature difference between TSS and C- agrees with the hysteresis. The second ‘traditional’ model invokes plastic deformation in zirconium caused by differences between the crystal axes in zirconium and those of the hydride.
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