Room temperature mechanical behavior of B2-ordered Fe3Al single crystals

A detailed study of room temperature mechanical behavior of B2-ordered Fe3Al single crystals had been conducted. It was found that the yield strength, plastic elongation and work hardening rate were changed with orientation. The orientation near [110] has 42% plastic elongation. At near [001] orientation, the plastic elongation is only 8.2%. The high work-hardening rate of the orientation near [110] was confirmed to be the result of superdislocation interaction. The dissociation of 2-fold superdislocations into single dislocation led to cross-slip, which corresponded to the parabolic stage of stress–strain curve. The low work-hardening rate of near [112] was due to the fact that only one single primary slip system is activated and the superdislocations remained 2-fold until the specimen was fractured.