Abstract
The deflection technique developed originally for the study of the reversible diffusion-elastic phenomenon has been generalized for the study of eventual irreversible changes due to cathodic charging. The total deflection may be resolved in many cases into two components which are due to irreversible and reversible changes. It was found useful to regard the ratio of these two components as a criterion for the extent of permanent structural changes due to hydrogen charging. The method was applied to the system PtPdH. Metallographic studies were used to detect conspicuous irreversible changes on the surface of the samples. Increased hydrogen solubility in the system studied (attained, for example, by further alloying with Pd) reduces irreversible changes due to hydrogen charging.
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