HYDROGEN IN ALUMINUM

The introduction of solute hydrogen in high purity aluminum has been s tudied using a variety of experimental techniques. Very large hydrogen concentrations were introduced by electrochemical charging and by che mical charging. Length change and lattice parameter measurements showe d that the hydrogen was trapped at vacancies which entered in a ratio close to C-v/C-H=1. Small angle X-ray scattering showed that the hydro gen-vacancy complexes clustered into platelets lying on the {111}.