Regensburg 2004 – scientific programme

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M: Metallphysik

M 20: Nanoskalige Materialien I

M 20.3: Talk

Wednesday, March 10, 2004, 15:15–15:30, H4

Thermal Stability of Ultra-Fine Grained ECAP Copper — •Sheila Bhaumik, Myrjam Winning und Günter Gottstein — Institut für Metallkunde und Metallphysik, RWTH Aachen

The reduction of the grain size down to the submicrometer regime opened new and fascinating aspects for research in several fields of materials science. One of the most important observations in ultra-fine grained or nanocrystalline materials is that with decreasing grain size the ratio between surface and volume strongly increases, so that the properties of the internal interfaces become more and more important. On the other hand volume effects like dislocation multiplication are hindered and finally suppressed. The thermal stability of massive ultra-fine grained copper was investigated. The used samples were produced by severe plastic deformation using the ECAP method (equal channel angular pressing). The influence of grain boundary triple junctions and the influence of the deformation character of the microstructure on the thermal behaviour was investigated by ex-situ investigations using SEM/EBSD. The experiments should give information about the correlation between the microstructure of ultra-fine grained materials and the stability against recrystallization and grain growth.