Diffusion in Metals, Intermetallics, Silicides, Quasicrystals and Metallic Glasses
Diffusion in Al-Fe Intermetallic Alloys
Aluminides of Fe, Ni, and Ti are technogically important high-temperature materials. Interdiffusion in Fe--Al
alloys was studied by electron-microprobe analysis for three series of
FexAl(1-x)/FeyAl(1-y) interdiffusion diffusion couples.
Interdiffusion coefficients were obtained from the diffusion profiles by a modified Boltzmann-Matano method
taking into account the composition dependence of the molar volume. Al tracer diffusivities were deduced from
the interdiffusion coefficients with the help of the Darken-Manning equation using Fe tracer diffusivities
available from a previous study in our laboratory and thermodynamic factors calculated on the basis of
theoretical models (GIF cooperation), the latter being verified by an analysis of the Kirkendall effect of the
interdiffusion couples. Al self-diffusion is slightly faster than Fe self-diffusion and is comparable to the
diffusion of the 65Zn and 114mIn radiotracers, which substitute Al on the
Al-sublattice of B2 Fe--Al and were used in the previous study from our laboratory to mimic Al
self-diffusion.
Diffusion of various alloying elements in binary Al-Fe alloys was studied by radiotracer
techniques over wide temperature ranges. The diffusion behaviour of solute elements was compared with
self-diffusion of the components and discussed in the light of preferred sublattice occupation of the solute
elements.
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