Interface diffusion in Cu processed by means of surface mechanical attrition treatment

Z. B. Wang, K. Wang, K. Lu, G. Wilde, S. Divinski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

A nanostructured surface layer with a gradient microstructure was produced on a Cu plate by means of the surface mechanical attrition treatment (SMAT). Diffusion of Ni in the nanostructured layer was investigated by the radiotracer technique at temperatures from 383 to 438 K. The measured diffusion profiles consist of two distinct sections with different slopes, the steep one corresponding to the top surface layer with the grain size of 10 to 25 nm and the shallow one corresponding to a subsurface layer with a grain size of 25 to 100 nm. The effective diffusivities derived from both sections are more than 2 orders of magnitudes higher than the grain boundary diffusivities in coarse-grained Cu. The significantly accelerated diffusion rates are expected to be associated with the "non-equilibrium" states of interfaces in the nanostructured surface layer induced by SMAT. The difference between the diffusivities in the top and sub-surface layer might result from the fact that most interfaces developed from twin boundaries in the former while produced by dislocation activities in the latter.

Original languageEnglish (US)
Title of host publicationDiffusion in Materials - DIMAT2008
PublisherTrans Tech Publications Ltd
Pages557-563
Number of pages7
Volume289-292
ISBN (Print)3908451728, 9783908451723
DOIs
StatePublished - 2009
Event7th International Conference on Diffusion in Materials - Lanzarote, Spain
Duration: Oct 28 2008Oct 31 2008

Conference

Conference7th International Conference on Diffusion in Materials
CountrySpain
CityLanzarote
Period10/28/0810/31/08

All Science Journal Classification (ASJC) codes

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

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