Asteman, H.; Spiegel, M.: Investigation of the chlorine attack caused by HCl (g) on oxide scales formed on pre-oxidized pure metals and commercial alloys. EUROCORR 2006, Maastricht, The Netherlands (2006)
Asteman, H.; Lill, K. A.; Hassel, A. W.; Spiegel, M.: Preparation and electrochemical characterisation by SDC of thin Cr2O3, Fe2O3 and (Fe,Cr)2O3 films, thermally grown on Pt-substrates. 6th Int. Symposium on Electrochemical Micro and Nanosystem Technologies, Düsseldorf, Germany (2006)
Spiegel, M.: Laboruntersuchungen zur Korrosion in thermischen Anlagen. Fachtagung: Werkstoffe und Verfahren der Energietechnik, Sulzbach-Rosenberg, Germany (2006)
Spiegel, M.: Einfluss der Veränderungen von gasförmigem Chloranteil und Rohrwandtemperaturen auf die Korrosion unter Belägen. VDI Wissensforum: Beläge und Korrosion in Großfeuerungsanlagen, Hannover, 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)
Asteman, H.; Spiegel, M.: Investigation of the chemical breakdown of protective oxides formed on pre-oxidized alloys caused by HCl (g) and H2O (g). Eurocorr 2005, Lisbon, Portugal (2005)
Asteman, H.; Lill, K.; Hassel, A. W.; Spiegel, M.: Local Measurements of the Semi conducting Properties of alpha-Fe2O3 and Cr2O3 Films by Impedance Measurement using the Scanning Droplet Cell Technique. 9th International Symposium on the Passivity of Metals and Semiconductors, Paris, France (2005)
Park, E.; Spiegel, M.: Development and Composition of the High Temperature Oxide Film Grown on Fe-15Cr during Annealing. Passivity 9, Paris, France (2005)
This study investigates the mechanical properties of liquid-encapsulated metallic microstructures created using a localized electrodeposition method. By encapsulating liquid within the complex metal microstructures, we explore how the liquid influences compressive and vibrational characteristics, particularly under varying temperatures and strain…
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
Magnetic properties of magnetocaloric materials is of utmost importance for their functional applications. In this project, we study the magnetic properties of different materials with the final goal to discover new magnetocaloric materials more suited for practical applications.
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…
The aim of the current study is to investigate electrochemical corrosion mechanisms by examining the metal-liquid nanointerfaces. To achieve this, corrosive fluids will be strategically trapped within metal structures using novel additive micro fabrication techniques. Subsequently, the nanointerfaces will be analyzed using cryo-atom probe…
In this project we pursue recent developments in the field of austenitic steels with up to 18% reduced mass density. The alloys are based on the Fe-Mn-Al-C system.
Local lattice distortion is one of the core effects in complex concentrated alloys (CCAs). It has been expected that the strength CCAs can be improved by inducing larger local lattice distortions. In collaboration with experimentalists, we demonstrated that VCoNi has larger local lattice distortions and indeed has much better strength than the…
Laser Powder Bed Fusion (LPBF) is the most commonly used Additive Manufacturing processes. One of its biggest advantages it offers is to exploit its inherent specific process characteristics, namely the decoupling the solidification rate from the parts´volume, for novel materials with superior physical and mechanical properties. One prominet…