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

K. Yoshimi, M. H. Yoo, S. Hanada

Research output: Contribution to conferencePaperpeer-review


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 a 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 (1̄01)[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.

Original languageEnglish
Number of pages11
Publication statusPublished - 1998 Jan 1
Externally publishedYes
EventProceedings of the 1998 TMS Fall Meeting - Rosemont, IL, USA
Duration: 1998 Oct 111998 Oct 15


OtherProceedings of the 1998 TMS Fall Meeting
CityRosemont, IL, USA

ASJC Scopus subject areas

  • Engineering(all)


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