A5061176456- Metallic Glasses and Amorphous Alloys
- Glass properties and applications
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Phase-change materials and chalcogenides
- Advanced Materials Characterization Techniques
- Material Dynamics and Properties
- Semiconductor materials and devices
- Thermodynamic and Structural Properties of Metals and Alloys
- Magnetic Properties of Alloys
- Surface Roughness and Optical Measurements
- MXene and MAX Phase Materials
- High Entropy Alloys Studies
- Electromagnetic wave absorption materials
- Non-Destructive Testing Techniques
- Force Microscopy Techniques and Applications
- Metallurgical and Alloy Processes
- Magnetic properties of thin films
- Metallurgical Processes and Thermodynamics
- Ion-surface interactions and analysis
- Hydrogen embrittlement and corrosion behaviors in metals
- Laser Material Processing Techniques
- Magnetic Properties and Applications
- Intermetallics and Advanced Alloy Properties
Max Planck Institute of Experimental Medicine
2023
RWTH Aachen University
2015-2023
Max-Planck-Institut für Nachhaltige Materialien
2021-2023
Extreme cooling rates during physical vapor deposition (PVD) allow growth of metastable phases. However, we propose that reactive PVD processes can be described by a gas–solid paraequilibrium defining chemical composition and thus point defect concentration. We show this notion allows for engineering controlling conditions. As example demonstrate thermal stability (Ti,Al)Nx, the industrial benchmark coating wear protection, increased from 800°C to unprecedented 1200°C minimizing vacancy The...
We investigate the effect of continuous vs. periodically interrupted plasma exposure during cathodic arc evaporation on elastic modulus as well residual stress state metastable cubic TiAlN coatings. Nanoindentation reveals that grown at floating potential with is 7%–11% larger than for coatings due to substrate rotation. In combination X-ray analysis, it evident governed by state. The experimental dependence in excellent agreement ab initio predictions. macroparticle surface coverage...
While bulk synthesis of MoAlB requires temperatures larger than 1000 °C with up to 40 % excess Al in the feedstock, here we report temperature range for formation single phase, orthorhombic synthesized by magnetron sputtering from a stoichiometric target is 450–650 °C. Lower yield amorphous films, while at 700 °C, impurity phases form addition MoAlB. Amorphous films were observed in-situ X-ray diffraction crystallize between 545 and 575 Hence, infer that thin surface diffusion mediated below...
High fracture toughness is crucial for the application of metallic glasses as structural materials to avoid catastrophic failure material in a brittle manner. One fingerprint fraction hybridized bonds, which affected by alloying Pd57.4Al23.5Y7.8M11.3 with M = Fe, Ni, Co, Cu, Os, Ir, Pt, and Au. It shown that experimental data correlated bonds scale localized at Fermi level. Thus, level are utilized quantitatively measure toughness. Based on ab initio calculations, minimum was identified...
Metallic glasses are promising structural materials due to their unique properties. For applications and processing the coefficient of thermal expansion is an important design parameter. Here we demonstrate that predictions for metallic by density functional theory based ab initio calculations efficient both with respect time resources. The predicted method utilising Debye-Grüneisen model a Pd-based glass, which exhibits pronounced medium range order. critically appraised in situ synchrotron...
Quantum mechanically guided materials design allows for the prediction of mechanical property trends and enables hence identification composition-structure-property relationships crystalline materials. However, quantum mechanics based guidelines material selection criteria ultra-strong metallic glasses have been lacking. Hence, on an ab initio model in conjunction with experimental high-throughput methodology geared towards revealing relationship between chemistry, topology properties, we...
Ab initio molecular dynamics simulations are used to systematically explore the influence of alloying on stiffness and plasticity Co–Fe–Ta–B metallic glasses. The Co(43.5)Ta(6.1)B(50.4) glass studied in this work, with a Young’s modulus 295 GPa, is stiffest known literature. From analysis density states it suggested that very large due strong covalent metal boron bonding. Furthermore has been observed by Y, Zr, Nb, Mo, Hf, W, C, N O bulk shear ratio can be varied from 2.08 2.82. As noted...
While it is accepted that the plastic behavior of metallic glasses affected by their free volume content, effect on chemical bonding has not been investigated systematically. According to electronic structure analysis, overall bond strength significantly content. However, with an increasing average coordination number decreases. Furthermore, fraction regions containing atoms a lower increases. As local character changes from anti-bonding decreasing number, weakened in number. During...
Abstract Chemically resolved atomic resolution imaging can give fundamental information about material properties. However, even today, a technique capable of such achievement is still only an ambition. Here, we take further steps in developing the analytical field ion microscopy (aFIM), which combines spatial (FIM) with time-of-flight spectrometry atom probe tomography (APT). To improve performance aFIM that are limited part by high level background, implement bespoke flight path...
Due to their unique property combination of high strength and toughness, metallic glasses are promising materials for structural applications. As the behaviour depends on electronic structure which in turn is defined by chemical composition, we systematically investigate influence B concentration glass transition, topology, magnetism, bonding concentrations x = 2 92 at.% (Co6.8±3.9Ta)100−xBx system. From an coordination point view, range divided into three regions: Below 39 ± 5 B, material a...
Thin film metallic glasses (MGs) are promising materials for electronic applications. While the transport properties of MGs composition dependent, influence hybridization on resistivity has not been investigated systematically. We implement a correlative experimental and computational approach utilizing thin deposition, electrical measurements, synchrotron X-ray diffraction ab initio calculations to explore relationship between fraction hybridized bonds present in PdAlY-M with M=Ir,Au,Ni,...
Abstract Wüstite, Fe 1− x O, is a crucial phase for the transition to CO 2 -free steel manufacturing as well promising electrochemical applications such water splitting and ammonia synthesis. To study effect of interfaces in these applications, thin-film model systems with defined are ideal. Previous studies lack description growth mechanism obtain O thin films. Here, we investigate formation metastable during reactive magnetron sputtering while systematically varying /Ar flow ratio from...
While multilayered thin film metallic glasses offer promising mechanical properties due to their interfaces, the correlation between chemical composition and strain at interfaces has not been investigated so far. Hence, atomic distance variations across glassy Co80Ta7B13 / Co62Ta6B32 are revealed by correlative transmission electron microscopy, nanobeam precession diffraction (NBPED) mapping atom probe tomography (APT). A dependent mean is identified for individual layers. At a chemically...
Thin film metallic glasses (MGs) are promising materials for electronic applications. While the transport properties of MGs composition dependent, influence hybridization on resistivity has not been investigated systematically. We implement a correlative experimental and computational approach utilizing thin deposition, electrical measurements, synchrotron X-ray diffraction ab initio calculations to explore relationship between fraction hybridized bonds present in PdAlY-M with M=Ir,Au,Ni,...