A review was presented of experimental data on H solubility, diffusivity, and trapping in polycrystalline Al and Al-based age-hardening alloys. It was pointed out that there was a wide variability, in experimentally measured effective diffusion coefficients and apparent solubilities in such materials, due to the sensitivity of test methods to the presence of surface oxides and to H-trapping at microstructural defects. Therefore, few measurements yielded dependable lattice diffusivities and solubilities. The present paper provided a compilation of the available literature, plus some new data, and covered H-interactions in high-purity Al, Al-Li and Al-Cu binary alloys, Al-Li-Cu-Zr (AA2090), Al-Cu-Mg (AA2024), Al-Zn-Mg-Cu (AA7075) and Al-Zn-Mg-Cu-Zr (AA7050) and a low-Cu variant of AA7050. Several H-trapping states were identified, including dislocations, distorted zones around vacancies, Li in solid solution and precipitates.

Hydrogen Solubility, Diffusion and Trapping in High-Purity Aluminium and Selected Al-Base Alloys. J.R.Scully, G.A.Young, S.W.Smith: Materials Science Forum, 2000, 331-337, 1583-600