Elhami, N.-N.; Zaefferer, S.; Thomas, I.; Hofmann, H.: Observation of the crystallographic defect structure in lightly deformed TWIP steel by means of electron channeling contrast imaging (ECCI). 1st International Conference on High Manganese Steels (HMnS2011), Seoul, South Korea (2011)
Steinmetz, D.; Zaefferer, S.: Currents state of the art in EBSD: Possibilities and limitations. Seminar Talk at Ludwig-Maximilians-Universität, München, Germany (2011)
Tasan, C. C.; Zaefferer, S.; Raabe, D.: Deformation induced dislocation interactions near martensite-ferrite phase boundaries. MRS Fall Meeting 2011, San Francisco, CA, USA (2011)
Davut, K.; Zaefferer, S.: A new large-area mapping technique to improve the statistical reliability of EBSD datasets. Royal Microscopy Society (RMS) EBSD 2011 Meeting, Düsseldorf, Germany (2011)
Sandlöbes, S.; Friák, M.; Dick, A.; Zaefferer, S.; Pei, Z.; Neugebauer, J.; Raabe, D.: Combining ab initio calculations and high-resolution experiments to understand advanced Mg alloys. German-Korean workshop on the “Production and industrial applications of semi-finished Mg products”, Irsee, Germany (2011)
Davut, K.; Zaefferer, S.: The effect of texture on the stability of retained austenite in Al-alloyed TRIP steels of Al-alloyed TRIP Steels. MRS 2010 Fall Meeting, Boston, MA, USA (2010)
Davut, K.; Zaefferer, S.: Statistical Reliability of EBSD Data Sets for the Characterization of Al-alloyed TRIP Steels. 15th International Metallurgy and Materials Congress, Istanbul, Turkey (2010)
Sandlöbes, S.; Zaefferer, S.: Effect of RE elements on the deformation and recrystallization behaviour of Magnesium. MagNET Workshop 5, Vancouver, Canada (2010)
Zaefferer, S.: Diffraction techniques in the scanning electron microscope: Making SEM a universal tool for microstructure research. Salzgitter-Mannesmann Summerschool, Duisburg, Germany (2010)
Khorashadizadeh, A.; Winning, M.; Zaefferer, S.; Raabe, D.: Recrystallization and grain growth in ultra fine grained CuZr alloy processed by high pressure torsion. Materials Science and Engineering MSE 2010, Darmstadt, Germany (2010)
Zambaldi, C.; Roters, F.; Zaefferer, S.; Raabe, D.: Surface Topographies after Nanoindentation and their Utilization to Quantify the Plastic Anisotropy of Gamma-TiAl on the Single Crystal Length Scale. Materials Science and Engineering MSE 2010, Darmstadt, Germany (2010)
Zaefferer, S.; Wu, G.: A critical review of orientation microscopy techniques in SEM and TEM. Facets of Electron Crystallography, Berlin, Germany (2010)
Oxides find broad applications as catalysts or in electronic components, however are generally brittle materials where dislocations are difficult to activate in the covalent rigid lattice. Here, the link between plasticity and fracture is critical for wide-scale application of functional oxide materials.
In this project we conduct together with Dr. Sandlöbes at RWTH Aachen and the department of Prof. Neugebauer ab initio calculations for designing new Mg – Li alloys. Ab initio calculations can accurately predict basic structural, mechanical, and functional properties using only the atomic composition as a basis.
The wide tunability of the fundamental electronic bandgap by size control is a key attribute of semiconductor nanocrystals, enabling applications spanning from biomedical imaging to optoelectronic devices. At finite temperature, exciton-phonon interactions are shown to exhibit a strong impact on this fundamental property.
Enabling a ‘hydrogen economy’ requires developing fuel cells satisfying economic constraints, reasonable operating costs and long-term stability. The fuel cell is an electrochemical device that converts chemical energy into electricity by recombining water from H2 and O2, allowing to generate environmentally-friendly power for e.g. cars or houses…
The project Hydrogen Embrittlement Protection Coating (HEPCO) addresses the critical aspects of hydrogen permeation and embrittlement by developing novel strategies for coating and characterizing hydrogen permeation barrier layers for valves and pumps used for hydrogen storage and transport applications.
In this project we study - together with the department of Prof. Neugebauer and Dr. Sandlöbes at RWTH Aachen - the underlying mechanisms that are responsible for the improved room-temperature ductility in Mg–Y alloys compared to pure Mg.
Efficient harvesting of sunlight and (photo-)electrochemical conversion into solar fuels is an emerging energy technology with enormous promise. Such emerging technologies depend critically on materials systems, in which the integration of dissimilar components and the internal interfaces that arise between them determine the functionality.
In this project, we work on a generic solution to design advanced high-entropy alloys (HEAs) with enhanced magnetic properties. By overturning the concept of stabilizing solid solutions in HEAs, we propose to render the massive solid solutions metastable and trigger spinodal decomposition. The motivation for starting from the HEA for this approach…