Plasticity of Nanocrystalline Materials

Horst Hahn, Technische Universität Darmstadt, Institute of Materials
Science, Petersenstr. 23, 64287 Darmstadt, Germany

From the beginning of research on nanocrystalline metals and ceramics
the mechanical properties and in particular the plasticity of these
novel class of materials have attracted much attention. This is due to
the fact, that the strong grain size dependence of mechanical
properties can lead to plastic behavior in brittle materials. There
are many reports on mechanical properties of nanocrystalline metals,
ceramics and composites. Some surprising results, i.e. the inverse
Hall-Petch relationship observed in nanocrystalline metals and alloys,
have led to the development of new theoretical models of the
deformation processes of materials with nanometer sized grains. In
addition, computer simulations have been employed substantially in the
last few years to analyze the atomistic processes during deformation.
In the talk the experimental results, the phenomenological models and
the results of computer simulations will be presented and compared
critically.

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