Diffusion in Nanostructured Materials

Abstract:

Recent results on diffusion in nanostructured materials are reviewed. The analysis highlights the importance of the proper account for a hierarchic microstructure which is often formed in nanostructured materials. The diffusion kinetics is such a material requires a special consideration in dependence on the temperature, diffusion time and the segregation level of the solute. Pressure-less sintering results in clustering of nanograins with significantly enhanced diffusivity of the inter-agglomerate boundaries. Severe plastic deformation produces a broad spectrum of high-angle grain boundaries (GBs) with different kinetic properties. The majority of the high-angle GBs reveals diffusivities very similar to those of general high-angle GBs in their well-annealed coarse-grained counterparts. Nevertheless, considerably faster short-circuit diffusion paths are detected, too. The origin, geometric arrangement, structural and kinetic properties of these high-diffusivity paths are comprehensively investigated and discussed.

• Periodical: Defect and Diffusion Forum (Volumes 289-292)
• Pages: 623-632
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.289-292.623
• Online since: April 2009
• Authors: Sergiy V. Divinski
• Keywords: Grain Boundary Diffusion, Nanocrystalline Material, Severe Plastic Deformation (SPD), Sintering

References

This article has no references.