Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 2: Symposium Severe Plastic Deformation I

MM 2.2: Fachvortrag

Montag, 27. März 2006, 10:45–11:15, IFW A

Recent developments in optimization of mechanical properties of mechanically alloyed/ball milled nanostructured materials — •Jürgen Eckert, Sergio Scudino, and Shankar Venkataraman — Physical Metallurgy Division, Department of Materials and Geo Sciences, Darmstadt University of Technology, Petersenstr. 23, D-64287 Darmstadt, Germany

One of the areas of research on nanostructured materials that has received extensive study is their mechanical behavior. The great interest in the mechanical behavior of nanostructured materials originates from the unique mechanical properties observed and/or predicted when the critical length-scale of the microstructure/phases approaches the nanoscale. Such features include increased hardness and strength as well as the expectation of enhanced ductility, and perhaps even superplastic behavior at low homologous temperatures. While some of these observations and predictions have been verified, some have been found to be due to high porosity or other processing artefacts, and not inherent properties of the nanostructured materials. This presentation reviews recent developments in the development of mechanically alloyed/ball milled nanostructured metals and alloys and addresses the limitations to ductility in nanocrystalline materials. Examples of recent breakthroughs wherein both high strength and good ductility are observed will be presented and discussed in the light of possible functional and structural applications for nanostructured materials. This work was supported by the German Science Foundation (DFG).