Prymak, O.; Stein, F.; Palm, M.; Frommeyer, G.; Raabe, D.: Konstitutionsuntersuchungen im System Nb-Cr-Al: Erste Ergebnisse und weitere Planungen. Workshop: The Nature of Laves Phases VII, MPI für Metallforschung Stuttgart, Germany (2006)
Stein, F.; Frommeyer, G.; Schneider, S. M.: Iron-Silicon Alloys with 3.5, 4.5 and 5.5 wt.% Si Processed under Microgravity. TEMPUS Parabolic Airplane Flight 2006 Meeting, DLR Bonn, Germany (2006)
Stein, F.: The Nature of Laves Phases – A Critical Assessment of the Current Knowledge on Structure and Stability of Laves Phases. Workshop "The Nature of Laves Phases VI, MPI für Chemische Physik fester Stoffe, Dresden, Germany (2006)
Palm, M.; Schneider, A.; Stein, F.; Sauthoff, G.: Strengthening of Fe–Al-Based Alloys for High-Temperature Applications. 3rd Disc.Meeting on the Development of Innovative Iron Aluminium Alloys, Mettmann-Düsseldorf, Germany (2006)
Spiegel, M.; Stein, F.; Pöter, B.: Initial Stages of Oxide Growth on Fe–Al Alloys. 3rd Disc.Meeting on the Development of Innovative Iron Aluminium Alloys, Mettmann-Düsseldorf, Germany (2006)
Stein, F.; Palm, M.: DTA Studies on the Fe–Al Phase Diagram. 3rd Disc.Meeting on the Development of Innovative Iron Aluminium Alloys, Mettmann-Düsseldorf, Germany (2006)
Palm, M.; Schneider, A.; Stein, F.; Sauthoff, G.: Iron-Aluminium-Base Alloys for Structural Applications at High Temperatures: Needs and Prospects. EUROMAT 2005, Prague, Czech Republic (2005)
Stein, F.; Dovbenko, O. I.; Palm, M.: Experimental Investigations of Structure Type Variations of Laves Phases. International Conference on "Modern Materials Science: Achievements and Problems", Kiev, Ukraine (2005)
Stein, F.; Dovbenko, O. I.; Palm, M.: Phase Relations between Laves Phases in Transition Metal Systems - Case Studies: Co–Nb, Al–Co–Nb, Cr–Ti, Fe–Zr, Al–Fe–Zr. EUROMAT 2005, Prague, Czech Republic (2005)
Dovbenko, O. I.; Palm, M.; Stein, F.: Phase Equilibria in the Al–Co–Nb Ternary System in the Vicinity of the Laves Phases. CALPHAD XXXIV, Maastricht, The Netherlands (2005)
Stein, F.; Frommeyer, G.: Untersuchung des Erstarrungsgefüges einer unter Schwerelosigkeit erschmolzenen intermetallischen TiAl-Legierung. Workshop "Entwicklung der Basis - Erkennen der Perspektiven", Materialwissenschaften und mg-Forschung, MPI für Eisenforschung, Düsseldorf, Germany (2005)
Dovbenko, O. I.; Palm, M.; Stein, F.: Investigation of the Phase Equilibria in the Al–Co–Nb System. Preliminary Results. International Workshop "Laves Phases IV", MPI für Eisenforschung, Düsseldorf, Germany (2005)
Dovbenko, O. I.; Palm, M.; Stein, F.: Investigation of the Phase Equilibria in the Al–Co–Nb System using Liquid-Solid Diffusion Couples. Preliminary Results. COST 535 Diffusion Couple Workshop, MPI für Eisenforschung, Düsseldorf, Germany (2004)
Stein, F.; Jiang, D.; Palm, M.; Sauthoff, G.: Laves Phase Polytypism in the Co–Nb System. TOFA 2004 - Discussion Meeting on Thermodynamics of Alloys, Wien, Austria (2004)
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.
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.
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.
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.
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.
We have studied a nanocrystalline AlCrCuFeNiZn high-entropy alloy synthesized by ball milling followed by hot compaction at 600°C for 15 min at 650 MPa. X-ray diffraction reveals that the mechanically alloyed powder consists of a solid-solution body-centered cubic (bcc) matrix containing 12 vol.% face-centered cubic (fcc) phase. After hot compaction, it consists of 60 vol.% bcc and 40 vol.% fcc. Composition analysis by atom probe tomography shows that the material is not a homogeneous fcc–bcc solid solution