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The influence of hydrogen, introduced by cathodization, on the dissipation of elastic energy in bars of plasticaly deformed palladium, vibrating flexurally, has been investigated in the temperature interval (80÷300) K, for frequencies in the kilocycle range. It has been found that the dislocations produced by plastic deformation give rise to two relaxation effects, having different properties. One of these effects is of intrinsic type, takes place when the material is deformed but not cathodized and is probably due to straight dislocation segments lying along Peierls valleys. The other effect appears to be due to the interaction of hydrogen with dislocation segments having their extremes anchored in different Peierls valleys and containing, therefore, geometrical kinks. The results are compared with those obtained in other f.c.c. metals (nickel, copper) and with the predictions of the available theories on hydrogen-dislocation interaction. |
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