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In Fe-rich FeAl, serrated plastic-flow behavior has been observed for the first time at room temperature. Serration on the tensile stress-strain curve occurs in single crystals that retained supersaturation of thermal vacancies after fast-cooling from the annealing temperature of 1173 K. In contrast to conventional serrated flow, the serrated flow in FeAl is associated with work hardening, and it becomes more pronounced with increasing Al content from 33 to 44 mol.%. The experimental results are interpreted in terms of the dynamic interaction of ({bar 1}01)[111] superdislocations with the excess thermal vacancies and their clusters, and the successive double cross-slip of screw superdislocations at the moving front of a slip band. The strong dependence on alloy composition and the lack of strain-rate sensitivity are discussed

Room-temperature serrated-flow behavior in Fe-rich FeAl under vacancy supersaturation