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Lecture

Advancing materials by SPD-mediated lattice defect engineering

Wednesday (26.09.2018)
16:30 - 16:45 S1/01 - A02
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Over the last two decades the processing method “Severe Plastic Deformation–SPD” has impressively demonstrated that nanostructured materials with superior mechanical properties can be produced ‘top-down’ in bulk shape which cannot be achieved with traditional ‘bottom-up’ methods. Now, the optimization of functional properties has been coming into the focus of the community’s research, not at least because of outstanding successes such as world-records in the figure-of-merit (ZT) of SPD-thermoelectrics, and in the reproducibility in the hydrogen storage of SPD-processed hydrogen storage materials. Recent investigations clearly suggest that a high density of SPD-induced lattice defects other than of classical grain boundaries can be equally or even more beneficial with respect to functional properties. For example, in case of thermoelectrics, SPD-induced dislocations and/or particular dislocation arrays seem to be most effective in increasing the ZT value. In several soft magnetic materials, regular dislocation arrays from SPD which form low-angle zero-strain nanocrystal boundaries promise new low-coercivity and high-magnetostriction materials. On the other hand, in the case of Mg-alloys, the vacancy-type defects produced in extremely high concentrations during SPD get a dominant role: They can achieve highly reversible absorption/desorption of hydrogen, but they also can cause considerable increases of strength after suitable thermal treatment. With the know-how to be obtained from systematic investigations, it should be possible to tailor specific defect structures on the nanoscale for optimum materials performances with very promising perspectives to practical application.

Speaker:
Prof. Dr. Michael Zehetbauer
University of Vienna
Additional Authors:
  • Prof. Dr. Ernst Bauer
    TU Wien
  • Dr. Maciej Krystian
    AIT Austrian Institute of Technology GmbH
  • Prof. Dr. Roland Grössinger
    TU Wien
  • Prof. Dr. Gerhard Krexner
    University of Vienna
  • Dr. Jelena Horky
    University of Vienna
  • Dr. Bernhard Mingler
    AIT Austrian Institute of Technology GmbH
  • Dr. Gerda Rogl
    TU Wien
  • Prof. Dr. Peter Rogl
    University of Vienna