Stein, F.; Palm, M.: Re-determination of transition temperatures in the Fe–Al system by differential thermal analysis. International Journal of Materials Research 98 (7), pp. 580 - 588 (2007)
Stein, F.; Palm, M.; Sauthoff, G.: Mechanical Properties and Oxidation Behaviour of Two-Phase Iron Aluminium Alloys with Zr(Fe,Al)2 Laves Phase or Zr(Fe,Al)12 τ1 Phase. Intermetallics 13 (12), pp. 1275 - 1285 (2005)
Pöter, B.; Stein, F.; Wirth, R.; Spiegel, M.: Early stages of protective layer growth on binary iron aluminides. Zeitschrift für physikalische Chemie 219, pp. 1489 - 1503 (2005)
Stein, F.; Palm, M.; Sauthoff, G.: Structure and stability of Laves phases. Part II: Structure type variations in binary and ternary systems. Intermetallics 13 (10), pp. 1056 - 1074 (2005)
Wasilkowska, A.; Bartsch, M.; Stein, F.; Palm, M.; Sauthoff, G.; Messerschmidt, U.: Plastic deformation of Fe–Al polycrystals strengthened with Zr-containing Laves phases: Part II. Mechanical properties. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing 381 (1-2), pp. 1 - 15 (2004)
Stein, F.; Palm, M.; Sauthoff, G.: Structure and stability of Laves phases. Part I - Critical assessment of factors controlling Laves phase stability. Intermetallics 12 (7-9), pp. 713 - 720 (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