Room temperature mechanical behavior of B2-ordered Fe3Al single crystals

A detailed study of room temperature mechanical behavior of B2-ordered Fe(3 )A1 single crystals had been conducted. It was found that the yield strengt h, plastic elongation and work hardening rate were changed with orientation . The orientation near [110] has 42% plastic elongation. At near [001] orie ntation, the plastic elongation is only 8.2%. The high work-hardening rate of the orientation near [110] was confirmed to be the result of superdisloc ation interaction. The dissociation of 2-fold superdislocations into single dislocation led to cross-slip, which corresponded to the parabolic stage o f 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 sup erdislocations remained 2-fold until the specimen was fractured. (C) 2001 E lsevier Science B.V. All rights reserved.