Microstructures and mechanical properties of Fe-Al-Ta alloys with strengthening Laves phase

D. D. Risanti*, G. Sauthoff

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


The addition of Ta to Fe-Al alloys results in the formation of a stable Ta(Fe,Al)2 Laves phase with hexagonal C14 structure in the Fe-Al phase at temperatures of 800, 1000 and 1150 °C. It was found that the solubility of Ta in Fe-Al is generally low and the solubility of Ta varies with Al content. Respective isothermal sections of the Fe-Al-Ta system have been established. Particular attention has been given to precipitation in the Fe3Al phase with a small addition of Ta. At intermediate temperatures, 600-750 °C, an additional Heusler-type phase with L21-structure precipitates, which transforms at longer times and high temperatures to the stable C14 Laves phase. The yield stress in compression and the creep behaviour of the Fe-Al-Ta alloys with various microstructures were studied. Due to the presence of the L21-Heusler phase, the yield stress and the creep resistance at temperatures below 700 °C was increased considerably.

Original languageEnglish
Pages (from-to)1727-1736
Number of pages10
Issue number11
Publication statusPublished - Nov 2011


  • A. Iron aluminides (based on FeAl)
  • B. Creep (properties and mechanisms)
  • B. Mechanical properties at high temperatures
  • B. Phase diagram
  • B. Phase transformation


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