A5089680612- Microstructure and Mechanical Properties of Steels
- Metal and Thin Film Mechanics
- Aluminum Alloys Composites Properties
- Magnesium Alloys: Properties and Applications
- Metal Alloys Wear and Properties
- Aluminum Alloy Microstructure Properties
- Microstructure and mechanical properties
- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Metallurgy and Material Forming
- Advanced Materials Characterization Techniques
- Metallurgical and Alloy Processes
- Corrosion Behavior and Inhibition
- Semiconductor materials and devices
- Advanced ceramic materials synthesis
- Advanced X-ray Imaging Techniques
- MXene and MAX Phase Materials
- Fuel Cells and Related Materials
- Magnetic properties of thin films
- Hydrogen embrittlement and corrosion behaviors in metals
- Magnetic and transport properties of perovskites and related materials
- Magnesium Oxide Properties and Applications
- ZnO doping and properties
- Nuclear Materials and Properties
- Thermal Expansion and Ionic Conductivity
Ernst Ruska Centre
2016-2025
Forschungszentrum Jülich
2016-2025
RWTH Aachen University
2016-2024
Max-Planck-Institut für Nachhaltige Materialien
2017
Max Planck Society
2017
AGH University of Krakow
2007-2014
The influence of chemical composition changes on the room temperature mechanical properties in binary Ca33Al67 C15 CaAl2 Laves phase were investigated two ternary alloys with off-stoichiometric compositions 5.7 at.% Mg substitution (Ca33Al61Mg6) and 10.8 3.0 Ca (Ca36Al53Mg11) compared to stoichiometric (Ca33Al67) composition. Cubic Ca-Al-Mg phases multiple crystallographic orientations characterised deformed using nanoindentation. hardness indentation modulus measured be 4.1 ± 0.3 GPa 71.3...
Mg-Al-Ca alloys with Laves phase reinforcement are suitable for structural applications. The composition, crystal structure, and distribution of phases can be tuned by the alloy composition heat treatment, which subsequently influence their mechanical properties. In this study, three model Mg-6Al-2Ca, Mg-5Al-3Ca Mg-4Al-4Ca were investigated, include C15, C36, C14 phases. as-cast have interconnected that form a skeleton structure. After annealing, they became more rounded particles, while...
This paper discusses the avoidance of hydrogen embrittlement (HE) in a medium manganese stainless steel X20CrNiMnVN18-5-10. We adopted HE-mitigation strategy that relies on improving its intrinsic resistance to by adjusting an ultrafine microstructure (∼1.3 µm) containing significant amount nano-sized V- and Cr-based precipitates size range 20 - ≥200 nm. The precipitation state was characterized using high-resolution scanning transmission electron microscope. Slow strain rate tests at 10−6...
The electrochemical corrosion mechanisms of Mg alloys were extensively studied in previous investigations different chemical compositions, modified surface states and various electrolyte conditions. However, recent research focused on the active state dissolution, leading to unresolved effects secondary phases adjacent a stable α-solid solution passive layer. present study investigates fundamental three Laves with varying phase morphologies fractions Mg-Al-Ca alloys. microstructure was...
In this study, a lamella prepared using focused ion beam (FIB) milling from magnesium–silver alloy wire was investigated. The wire, intended for biomedical applications, initially degraded in simulated body fluid (SBF) under physiological conditions. Raman spectroscopy performed across the entire FIB specimen and results were correlated with findings scanning transmission electron microscopy (STEM). Our micro-Raman analysis identified chemical compounds at distinct regions within specimen....
A novel medium manganese (MMn) steel with additions of Cr (18%), Ni (5%), V (1%), and N (0.3%) was developed in order to provide an enhanced corrosion resistance along a superior strength–ductility balance. The laboratory melted ingots were hot rolled, cold finally annealed at 1000 °C for 3 min. recrystallized single-phase austenitic microstructure consisted ultrafine grains (~1.3 µm) substantial amount Cr- V-based precipitates bimodal particle size distribution (100–400 nm <20 nm)....
The mechanical behaviour of Mg-Al alloys can be largely improved by the formation an intermetallic Laves phase skeleton, in particular creep strength. Recent nanomechanical studies revealed plasticity dislocation glide (Mg,Al)$_2$Ca phase, even at room temperature. As strengthening this remains, however, brittle low In work, we present experimental evidence slip transfer from Mg matrix to skeleton temperature and explore associated mechanisms means atomistic simulations. We identify two...
Correlative scanning transmission electron microscopy, atom probe tomography, and density functional theory calculations resolve the correlation between elastic strain fields local impurity concentrations on atomic scale. The correlative approach is applied to coherent interfaces in a $\ensuremath{\kappa}$-carbide strengthened low-density steel establishes tetragonal distortion of fcc-Fe. An interfacial roughness $\ensuremath{\sim}1\phantom{\rule{4pt}{0ex}}\mathrm{nm}$ localized carbon...
The microstructure of Mg-Al-Ca alloys consists a hard intra- and intergranular eutectic Laves phase network embedded in soft α-Mg matrix. For such heterogeneous microstructures, the mechanical response co-deformation both phases under external load are not yet fully understood. We therefore used nano- microindentation combination with electron microscopy to study deformation behaviour an Mg-3.68Al-3.8Ca alloy. found that hardness Mg2Ca was significantly larger than stays constant within...
Functional materials feature hierarchical microstructures that define their unique set of properties. The prediction and tailoring these require a multiscale knowledge the mechanistic interaction microstructure property. An important material in this respect is biodegradable magnesium alloys used for implant applications. To correlate relationship between nonlinear degradation process, high-resolution situ three-dimensional (3D) imaging experiments must be performed. For purpose, novel...