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Bulk Nanostructured Metals by Severe Plastic Deformation (SPD)

M.J. Zehetbauer, M. Krystian and W. Lacom
Vienna University, AT

Keywords:
nanometals, severe plastic deformation, constitutive modelling

Abstract:
The top-down methods of “Severe Plastic Deformation (SPD)” have been shown to have the potential for directly converting conventional metals into submicron- or nano-scaled bulk materials. These techniques exhibit significant advantages compared to bottom-up ones: Bulk nanomaterials are achieved in fully dense shape without involving dangerous nanopowders, and without grain coarsening as during nanopowder consolidation. In addition to increased strength and enhanced magnetic properties, SPD-nanometals exhibit a considerable ductility up to superplastic behaviour, a higher fatigue limit and superior hydrogen storage performance. The spectacular mechanical properties recommend SPD materials for aerospace and automotive industry, for metals machining tools, and for advanced sputtering targets. SPD bulk nanomagnets are suited for computer hardware, generators, transformers, and mechatronic systems. The high superplastic formability of SPD materials will speed up the production process of Al- and Mg-alloys by at least a factor 10. New results of properties of several SPD-processed materials will be presented, together with features of structural characterization. Using new mechanical property data of SPD CP-Ti it is shown that the constitutive model of one of the authors very well describes both the experimental strengthening data and the evolution of microstructural parameters such as cell size and dislocation density.

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