ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The radiotracer technique was applied to measure self- (Fe, Ni) and solute- (Ag) grainboundary diffusion in nanocrystalline Fe-40wt.%Ni alloy. The nanocrystalline material wasprepared by pressureless sintering of the nanoalloy powders. The nano-sized crystallites werefound to be clustered in micrometer-large agglomerates. Two types of internal interfaces withfundamentally different properties exist in the nanomaterial: the grain boundaries between thenanocrystallites and the interfaces between the agglomerates. A complete and consistent model ofthe diffusion processes in such material is elaborated. Whereas the nanocrystalline boundariesreveal diffusivities, which are similar to those in coarse-grained material, diffusion along interagglomerateinterfaces occurs faster by orders of magnitude. This behavior is explained by a nonrelaxedstructure of the inter-agglomerate interfaces
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.5019.pdf
Permalink