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In-situ powder diffraction was used to study the annealing of dislocations inthe archetypal hydrogen absorbers Pd and LaNi5. The relationship betweendislocations and trapped hydrogen was explored using thermally induceddesorption. It was found that the dislocations in Pd caused by hydrogenabsorption anneal over a wide range of temperatures and that although theystart to anneal below 250 $^\circ$C, temperatures well above 750 $^\circ$C arerequired to fully anneal the metal. It was shown that allowing further time atlower temperatures does not further anneal the metal. It is suggested that thisis due to dislocation tangling and pinning, causing different temperatures tobe required for different pinning defects. It was found that hydrogen trappedin LaNi5 is released in a wide range of temperatures and it was thereforeconcluded that hydrogen is trapped in the dislocation strain field anddislocation core as well as vacancies. The direct comparison of deuteriumrelease and dislocation density showed no correlation, in agreement withprevious indirect comparisons. Dislocations in LaNi5 were shown to anneal attemperatures as low as 150 $^\circ$C, in contrast to previous reports whichsuggested more than 500 $^\circ$C was required. This lower annealingtemperature for dislocations at least partly explains why low temperatureageing increases the pressure hysteresis in hydrogen cycled LaNi5.

Kinetics of dislocation annealing and the effect of trapped hydrogen, investigated with in-situ diffraction