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MM: Metall- und Materialphysik

MM 35: Growth

MM 35.4: Vortrag

Donnerstag, 30. März 2006, 15:30–15:45, IFW B

Grain growth of two-dimensional grain structures with surfaces: a vertex dynamics approach — •Daniel Weygand — IZBS, Kaiserstr. 12, University of Karlsruhe, 76133 Karlsruhe

The time evolution of a two dimensional grain structure in presence of surfaces, e.g. a fibre geometry, is investigated. The influence of surface grooving and inhomogeneous heat treatments on the final microstructure is modelled using an enhanced vertex dynamics simulation. It is shown that, starting from a populations obtained by normal grain growth, the microstructure evolves toward a bamboo structure with interesting properties, e.g. depending on grooving parameter, grains with an non-uniaxial shape factor in the range of 1 to 7 occur. The grain size distribution is broader and larger grains are able to keep their size advantage due to the presence of the surfaces.