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An ultrafine-grained surface layer was fabricated on a pure Fe plate by the shot peening process. The average grain size within the surface layer of 10μm thick is about 28nm. The diffusion kinetics of Al was measured by secondary ion mass spectrometry within a temperature range of 300–380°C. The diffusion coefficient of Al in the nanocrystalline layer is about 4 orders of magnitude higher than that...
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