Self- and Solute Diffusion, Interdiffusion and Thermal Vacancies in the System Iron-Aluminium

• DOI: 10.4028/www.scientific.net/ddf.333.1
• Publication Date: 2013-03-11T15:43:09Z
• Authors: Helmut Mehrer; Martin Luckabauer; Wolfgang Sprengel
• Keywords: FEAL; TRACER; Self-diffusion

Starting from fundamental aspects of thermal vacancies and solid-state self-and solute diffusion, this paper reviews procedures for tracer-and interdiffusion studies the major techniques vacancy by dilatometry positron annihilation in metals. Equilibrium diffusion performed on pure iron aluminium are mentioned at first. We also comment some peculiarities aluminium. Positron differential Fe-Al alloys with various compositions summarized new experimental authors reported migration Fe 61 Al 39 . All these indicate a relatively high fraction low mobility type iron-aluminides as compared to Tracer several substitutional solutes such Co, Ni, Cr, Mn, Zn, In Münster laboratory summarized. The cover alloy composition between 3 FeAl structures A2, B2 D0 Interdiffusion coefficients obtained couples discussed together tracer data. Darken-Manning equation is used deduce diffusivities therefrom. latter hardly accessible radiotracer experiments due lack suitable tracer. Diffusion slightly faster than indicating mechanisms coupled jumps atoms.