Stein, F.; He, C.: The Usefulness and Applicability of the Alkemade Theorem for the Determination of Ternary Phase Diagrams with Intermetallic Phases. TOFA 2014 – 14th Discussion Meeting on Thermodynamics of Alloys, Brno, Czech Republic (2014)
Stein, F.; Li, X.; Palm, M.; Scherf, A.; Janda, D.; Heilmaier, M.: Fe–Al Alloys with Fine-Scaled, Lamellar Microstructure: A New Candidate for Replacing Steels in High-Temperature Structural Applications? 60th Anniversary Metal Research Colloquium organized by the Department for Metal Research and Materials Testing of the University Leoben, Lech am Arlberg, Austria (2014)
Stein, F.: Stability, Structure and Mechanical Properties of Transition-Metal-Based Laves Phases. Institut de Chimie et des Matériaux, CNRS-Université Paris Est, Paris, France (2013)
Stein, F.: Experiments on the Peritectoid Decomposition Kinetics of the Intermetallic Phase Nb2Co7. 4th Sino-German Symposium on Computational Thermodynamics and Kinetics and Its Application to Materials Processing, Bochum, Germany (2013)
Stein, F.; Vogel, S. C.: Structure and Stability of the γ Brass-Type High-Temperature Phases in Al-Rich Fe–Al(–Mo) Alloys. Intermetallics 2013, Bad Staffelstein, Germany (2013)
Vogel, S. C.; Brown, D. W.; Okuniewski, M.; Stebner, A.; Stein, F.: Characterization of Intermetallics with the HIPPO & SMARTS Neutron Beam-Lines at LANSCE. Intermetallics 2013, Educational Center Kloster Banz, Bad Staffelstein, Germany (2013)
He, C.; Stein, F.: Thermodynamic Assessment of the Fe–Nb and Fe–Al–Nb Systems. HTMC XIV, 14th International IUPAC Conference on High Temperature Materials, Beijing, China (2012)
Stein, F.; He, C.: Experimental Investigations of the Fe–Al–Nb System: Solidification and Liquidus Surface. HTMC XIV, 14th International IUPAC Conference on High Temperature Materials, Beijing, China (2012)
Stein, F.; Voß, S.; Palm, M.: Mechanical properties of transition-metal laves phases. Plasticity 2012, Symp. on Plasticity and Its Current Applications, San Juan, Puerto Rico (2012)
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