This paper reviews recent research on embrittlement of iron aluminides brought about by exposure to moisture or hydrogen. The tensile and fatigue crack growth behavior of several Fe-Al alloys, ranging in aluminum content from 16 to 35a%, is described. It will be shown that tensile ductility and fatigue crack growth behavior are dependent on type and degree of long range order, grain structure, temperature and environment. Environments studied include vacuum,oxygen, hydrogen gas, electrolytically charged hydrogen and moist air. All cases of embrittlement are ultimately traceable to the interaction of hydrogen with the lattice.
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