Abstract
Diffusion couples, Fe-6.8 wt% AI-1.0 wt% Si/Fe and Fe-6.3 wt% AI-0.9 wt% Si/Fe were constructed and separately annealed at 1050°C for 3 h and at 1000°C for 64 h. The concentration profiles of Fe, Al and Si atoms in these couples were measured by electron probe micro-analysis (EPMA), while the diffusion behavior was also simulated by coupling thermodynamic and kinetic properties of Fe-AI-Si system. The simulation results were in good agreement with the measured concentration profiles showing the validity of dynamic parameters of Fe-AI-Si system. Calculation was made for Fe-7 wt% Al-1 wt% Si/Fe diffusion couples at 1000°C with different diffusion time. Silicon uphill was found under the influence of aluminum.
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