Abstract
Tritium electron microautoradiography has been carried out on an Al-33 mass% Cu alloy with a lamellar-like eutectic structure in order to elucidate the H trapping and absorbing behaviour of the θ-phase (Al2Cu). It has been found that the θ-phase traps H, and it is suggested that it is the large volume of the dumbbell-shaped space of a pair of tetrahedral interstitial sites in the structure of the θ-phase which attracts H.