Plasticity and grain boundary diffusion at small grain sizes

Gerhard Wilde, Jens Ribbe, Gerrit Reglitz, Matthias Wegner, Harald Rösner, Yuri Estrin, Michael Zehetbauer, Daria Setman, Sergiy Divinski

Research output: Contribution to journalArticleResearchpeer-review

56 Citations (Scopus)

Abstract

Bulk nanostructured-or ultrafine-grained materials are often fabricated by severe plastic deformation to break down the grain size by dislocation accumulation. Underlying the often spectacular property enhancement that forms the basis for a wide range of potential applications is a modification of the volume fraction of the grain boundaries. Yet, along with the property enhancements, several important questions arise concerning the accommodation of external stresses if dislocation-based processes are not longer dominant at small grain sizes. One question concerns so-called "non-equilibrium" grain boundaries that have been postulated to form during severe deformation and that might be of importance not only for the property enhancement known already today, but also for spectacular applications in the context of, e.g., gas permeation or fast matter transport for self-repairing structures. This contribution addresses the underlying issues by combining quantitative microstructure analysis at high resolution with grain boundary diffusion measurements.

Original languageEnglish
Pages (from-to)758-764
Number of pages7
JournalAdvanced Engineering Materials
Volume12
Issue number8
DOIs
Publication statusPublished - Aug 2010

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