Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 31: Nanocharacterization
MM 31.8: Vortrag
Mittwoch, 28. März 2012, 12:00–12:15, H 1029
Mechanism of nanostructure formation during in in-situ consolidation of mechanically-milled copper — •Mohsen Samadi Khoshkhoo1,2, S. Scudino1, H. Bahmanpour3, A. Kauffmann1, J. Freudenberger1, R. Scattergood3, M. J. Zehetbauer4, C. C. Koch3, and J. Eckert1,2 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany — 3Department of Materials Science and Engineering, North Carolina State University, Campus Box 7907, Raleigh, NC 27695-7907, USA — 4Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria
Bulk nanocrystalline Cu samples have been produced by in-situ consolidation during mechanical milling. The effect of milling temperature and milling intensity on the structure of the samples was studied in detail and particular attention was paid to reach the optimal conditions for successful in-situ consolidation. Microstructural evolution during milling was monitored using X-ray diffraction analysis assisted with the whole powder pattern modeling (WPPM) technique. The results show that the dislocation density increases continuously with milling time, reaches a maximum and then decreases with further milling. Transmission electron microscopy (TEM) investigations carried out before and after the observed maximum of dislocation density reveal that dynamic recrystallization is responsible for the reduction of dislocation density. The mechanism of nanostructure formation through dynamic recrystallization was studied in detail using high-resolution TEM analysis and scanning electron microscopy.