Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 3: Topical Session Bulk Nanostrucured Materials I - Processing

MM 3.1: Topical Talk

Montag, 26. März 2012, 10:15–10:45, H 0107

Generation of nanocomposites and super saturated solid solutions by SPD — •Reinhard Pippan, Andrea Bachmaier, Anton Hohenwarter, and Georg Rathmayr — Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstr.12,

Severe plastic deformation (SPD) is a very powerful tool to generate ultrafine grained or nanocrystalline materials. The thermal stability of the SPD processed single phase materials is often low and the refinement is often limited to the 100 nm regime. In order to overcome this drawback we have tried to stabilize the grain structure and to generate even finer nanostructures by second phases. Different types of materials, composites of miscible and immiscible metals, dual phase metallic materials, metal-oxide composites with extreme variations in size and concentration of oxides have been HPT deformed up to very high strains. The microstructural evolution has been examined and the refinement process is analysed. In most cases a bulk nanocomposite or a supersaturated solid solution with nanocrystalline structure or a mixture of them is formed. The fragmentation process as well as the phenomena resulting in a supersaturated solid solution and finally in a saturation will be discussed. Finally, the stability of the different nanostructured is examined and the coarsening phenomena will be considered. Financial support by the FWF Austrian Science Fund is appreciated (project S 10402-N16).