U. Prakash et al., EFFECT OF TITANIUM SUBSTITUTION ON THE STRUCTURE AND PROPERTIES OF FE3AL-BASED INTERMETALLIC ALLOYS, Journal of Materials Science, 31(6), 1996, pp. 1569-1573
Substitutions (0-16 at%) of titanium for iron in Fe3Al-based alloys ra
pidly solidified by chili-block melt-spinning stabilize the DO3 and B2
ordered structures. Rapid solidification results in total suppression
of DO3 order in binary alloys, whereas alloys containing titanium hav
e DO3 structure. DO3 and B2 antiphase domain size, lattice parameter a
nd hardness increase with increasing titanium content of the alloy. Th
e deformation mode changes from single (unit) bcc dislocation in binar
y alloys to two-fold superdislocation configuration in DO3Fe3Al-Ti all
oys. Mechanical antiphase boundaries are generated by the movement of
these imperfect configurations. All the. alloys exhibited cleavage ten
sile failure. The mechanical properties are correlated with the observ
ed structural changes.