Interdiffusion and AI self-diffusion in iron-aluminides

M. Salamon, D. Fuks, H. Mehrer

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We have investigated interdiffusion in iron-aluminium alloys using single-phase interdiffusion couples of FexA\1-x-Fe yA\1-y for three combinations of x and y for Al contents between 18 and 49.5 at. % Al. Experimental diffusion profiles were obtained from electron-microprobe analysis of the diffusion zone. Interdiffusion coefficients were deduced via the Sauer-Preise method taking into account volume changes. A temperature interval between 997 and 1447 K was covered in our experiments. Thermodynamic factors were obtained from two theoretical models and judged by an analysis of the Kirkendall effect in the diffusion couples. The Darken-Manning equation was used to deduce self-diffusion coefficients of aluminium from the present interdiffusion coefficients, the thermodynamic factors, the vacancy-wind factors, and the iron tracer diffusivities obtained recently at the Münster laboratory. The results show that Al diffusion is always slightly faster than Fe diffusion. The difference never exceeds a factor of three. This small difference indicates that Fe and Al diffusion in B2 ordered iron-aluminides are closely coupled.

Original languageEnglish
Pages (from-to)444-449
Number of pages6
JournalDefect and Diffusion Forum
Issue numberPART 1
StatePublished - 1 Jan 2005


  • Darken-Manning equation
  • Interdiffusion
  • Iron-aluminides
  • Self-diffusion of Al
  • Thermodynamic factor
  • Vacancy-wind factor

ASJC Scopus subject areas

  • Radiation
  • General Materials Science
  • Condensed Matter Physics


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