Experimental and Simulation Study of Uphill Diffusion of Al in a Pt-Coated γ-Ni-Al Model Alloy
Source abstract
Abstract
An experimental study of diffusion of Al, Ni, and Pt in a Pt-coated binary Ni-Al alloy has been made and compared with a computer simulation. Assessed thermodynamic and kinetic descriptions have been used. Starting from the measured experimental concentration profiles after 1 h heat treatment at 1173 K the simulation is compared to the experimentally determined profiles after 11 h continuous heat treatment. The experimental finding that Al will diffuse against its concentration gradient is explained by the strong lowering of the chemical potential by Pt. The simulation predicts that Al will reach a concentration maximum at the surface, larger than its bulk composition.
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Research context
OpenAlex topics: nanoparticles nucleation surface interactions · Intermetallics and Advanced Alloy Properties · Advanced Materials Characterization Techniques
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