Using grain boundary engineering to evaluate the diffusion characteristics in ultrafine-grained Al-Mg and Al-Zn alloys

Takashi Fujita, Zenji Horita, Terence G. Langdon

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

Samples of dilute Al-Mg and Al-Zn alloys, containing a minor Sc addition, were processed by equal-channel angular pressing (ECAP) to achieve grain refinement and different distributions of the grain boundary misorientations. Diffusion experiments were conducted on fine-grained alloys with either low or high fractions of grain boundaries having high-angle misorientations and on unpressed coarse-grained samples. The diffusion couples were annealed at temperatures from 493 to 848 K and the interdiffusion coefficients were determined from the concentration profiles using the Boltzmann-Matano technique. The results show the interdiffusion coefficients tend to be higher in fine-grained alloys having high fractions of high-angle boundaries than in fine-grained alloys having high fractions of low-angle boundaries. The experimental data are used to estimate values for the grain boundary diffusion coefficients.

Original languageEnglish
Pages (from-to)241-250
Number of pages10
JournalMaterials Science and Engineering A
Volume371
Issue number1-2
DOIs
Publication statusPublished - 2004 Apr 25

Keywords

  • Diffusion
  • Equal-channel angular pressing (ECAP)
  • Grain boundary engineering
  • Interdiffusion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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