Inelastic neutron scattering study of hydrogen embrittlement in titanium alloys

Abstract

Inelastic neutron scattering studies have been carried out on the mixed α and β phase of the titanium alloy IMI T318 for hydrogen loadings ranging from 400 to 15500 ppm (a hydrogen loading of 80 ppm gave a spectrum too weak for interpretation) For a hydrogen content of 15 500 ppm, metal subsurface tetrahedral interstitial sites were occupied. As the hydrogen content was decreased, it became evident that an additional site was occupied, this was assigned to hydrogen in surface threefold symmetry binding sites.