Abstract
The free energy loss has been theoretically evaluated in the model NbH system at 313 K for the solid solution → monohydride and monohydride → dihydride transformations. The origin for this hysteresis loss has been explained by considering the elasto-plastic accommodation processes that occur in the NbH system during these hydrogen transformations. The calculated free energy loss for the solid solution → monohydride transformation shows excellent agreement with experimental results. Possible sources of error in the calculations have been elucidated. The present elasto-plastic approach is compared with previous theories of hysteresis. It is found that the elasto-plastic accommodation theory offers the best explanation for the hysteresis phenomenon observed in metal-hydrogen systems.
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