Dependence of the brittle-to-ductile transition temperature (BDTT) on the Al content of Fe-Al alloys

D. Risanti*, J. Deges, L. Falat, S. Kobayashi, J. Konrad, M. Palm, B. Pöter, A. Schneider, C. Stallybrass, F. Stein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


The brittle-to-ductile transition temperature (BDTT) of binary Fe-Al alloys with between 9.6 and 45 at.% Al was investigated in the as-cast state by four-point bending tests. An increase of the BDTT was observed with increasing aluminium content between 9.6 and 19.8 at.%. Up to 41.3 at.%, the BDTT did not change significantly. A sharp increase of the BDTT occurred between 41.3 and 45 at.% Al. Transgranular cleavage was observed at a composition of 25 at.% Al, mixed-mode fracture between 39.6 and 41.3 at.% Al and intergranular fracture at 45 at.% Al. The results indicate that the increase in BDTT is correlated with the transition from mixed-mode to intergranular fracture.

Original languageEnglish
Pages (from-to)1337-1342
Number of pages6
Issue number12
Publication statusPublished - Dec 2005
Externally publishedYes


  • A. Iron aluminides (based on FeAl)
  • A. Iron aluminides (based on FeAl)
  • B. Brittleness and ductility
  • B. Fracture mode
  • B. Mechanical properties at ambient temperature
  • B. Mechanical properties at high temperatures


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