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HomeMaterials Science ForumMaterials Science Forum Vols. 539-543Diffusion Properties of Internal Interfaces in...

Diffusion Properties of Internal Interfaces in Bulk Nanocrystalline Materials: Radiotracer Investigation

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Abstract:

The radiotracer technique was applied to measure self- (Fe, Ni) and solute- (Ag) grain boundary diffusion in nanocrystalline Fe-40wt.%Ni alloy. The nanocrystalline material was prepared by pressureless sintering of the nanoalloy powders. The nano-sized crystallites were found to be clustered in micrometer-large agglomerates. Two types of internal interfaces with fundamentally different properties exist in the nanomaterial: the grain boundaries between the nanocrystallites and the interfaces between the agglomerates. A complete and consistent model of the diffusion processes in such material is elaborated. Whereas the nanocrystalline boundaries reveal diffusivities, which are similar to those in coarse-grained material, diffusion along interagglomerate interfaces occurs faster by orders of magnitude. This behavior is explained by a nonrelaxed structure of the inter-agglomerate interfaces.

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Periodical:

Materials Science Forum (Volumes 539-543)

Pages:

5019-5024

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.539-543.5019

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Online since:

March 2007

Authors:

Sergiy V. Divinski, Jai Sung Lee, Christian Herzig

Keywords:

Agglomeration, Grain Boundary Diffusion, Nanocrystalline Material, Powder Metallurgy (PM)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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