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Interdiffusion and Al Self-Diffusion in Iron-Aluminides

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Abstract:

We have investigated interdiffusion in iron-aluminium alloys using single-phase interdiffusion couples of FexAl1−x–FeyAl1−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-Freise 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 M¨unster 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.

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Periodical:

Defect and Diffusion Forum (Volumes 237-240)

Pages:

444-449

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.237-240.444

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Online since:

April 2005

Authors:

Marcel Salamon, David Fuks, Helmut Mehrer

Keywords:

Darken-Manning Equation, Interdiffusion, Iron Aluminide, Self-Diffusion of Al, Thermodynamic Factor, Vacancy Wind Factor

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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