Tensile tests were performed, in air or vacuum, on Fe–40Al single crystals which were oriented so that predominately edge or screw dislocations accommodated the plastic strain. It was found that, for both orientations, the ductility was lower in air than in vacuum. However, no detectable correlation was found between the nature of the dislocations and the effect of the environment.

The Role of Edge and Screw Dislocations on Hydrogen Embrittlement of Fe-40Al. M.Wittmann, D.Wu, I.Baker, E.P.George, L.Heatherly: Materials Science and Engineering A, 2001, 319-321, 352-5