Plasticity and grain boundary diffusion at small grain sizes

Autor(en)

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

Abstrakt

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.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Universität Münster, Monash University

Journal

Advanced Engineering Materials

Band

12

Seiten

758-764

Anzahl der Seiten

7

ISSN

1438-1656

DOI

https://doi.org/10.1002/adem.200900333

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103023 Polymerphysik, 210006 Nanotechnologie, 103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/825a7ed6-89e3-4b7f-b700-ecdf5ab26142