A5032624500- Hydrogen Storage and Materials
- Magnesium Alloys: Properties and Applications
- Boron and Carbon Nanomaterials Research
- Ammonia Synthesis and Nitrogen Reduction
- Aluminum Alloys Composites Properties
- Ga2O3 and related materials
- Advanced materials and composites
- ZnO doping and properties
- Microstructure and mechanical properties
- Metallic Glasses and Amorphous Alloys
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Advanced Photocatalysis Techniques
- Nuclear Materials and Properties
- Superconductivity in MgB2 and Alloys
- Fusion materials and technologies
- High-pressure geophysics and materials
- Muon and positron interactions and applications
- GaN-based semiconductor devices and materials
- Metal and Thin Film Mechanics
- Advanced ceramic materials synthesis
- High Entropy Alloys Studies
Eötvös Loránd University
2013-2023
Hungarian Academy of Sciences
2022-2023
HUN-REN Centre for Energy Research
2023
Institute for Technical Physics and Materials Science
2023
Ultrafine-grained and heterostructured materials are currently of high interest due to their superior mechanical functional properties. Severe plastic deformation (SPD) is one the most effective methods produce such with unique microstructure-property relationships. In this review paper, after summarizing recent progress in developing various SPD for processing bulk, surface powder materials, main structural microstructural features SPD-processed explained including lattice defects, grain...
A high-energy ball milling and subsequent high-pressure torsion method was applied to synthesize nanocrystalline magnesium samples catalyzed by TiO2 or titanate nanotubes. The microstructure of the as-milled powders torqued bulk disks characterized X-ray diffraction. recorded diffractograms have been evaluated convolutional multiple whole profile fitting algorithm, which provided microstructural parameters (average crystal size, crystallite size distribution, average dislocation density)....
Solid-state hydrogen storage in various metal hydrides is among the most promising and clean way of storing energy, however, some problems, such as sluggish kinetics high dehydrogenation temperature should be dealt with. In present paper advances severe plastic deformation on hydrogenation performance will reviewed. Techniques, like high-pressure torsion, equal-channel angular pressing, cold rolling, fast forging surface modification have been widely applied to induce lattice defects,...
High energy ball milling and subsequent high-pressure torsion method was carried out on nanocrystalline Mg powders catalyzed by 5 wt.% Nb₂O5 carbon nanotubes. In the present research two distinct routes were performed in order to reveal influence of processing conditions hydrogenation behavior investigated alloys. The hydrogen sorption milled bulk disks examined a Sieverts'-type apparatus. Structural characterization has been high-resolution transmission electron microscopy X-ray diffraction.
High-pressure torsion was performed on commercial magnesium disks under uniaxial compression and simultaneously shear straining for different number of turns. Microstructural evolution during the severe plastic deformation process has been investigated by X-ray diffraction line profile analysis. Complementary hydrogen absorption experiments in a Sieverts’-type apparatus indicated that storage microstructural parameters exhibit correlation.
A high-energy ball-milling method was applied for different milling times (1 h, 3 and 10 h) to synthetize nanocrystalline MgH2 powder samples catalyzed by Fe2Ti. Morphology microstructure of the powders were characterized scanning electron microscopy X-ray diffraction. The recorded diffraction profiles evaluated convolutional multiple whole profile fitting algorithm, in order determine microstructural parameters composites, such as average crystallite size dislocation density. Differential...
Ga2O3 is a promising material in the optoelectronics and semiconductor industry. In this work, gallium oxide thin films were deposited via radio frequency (RF) sputtering, using liquid Ga target. The reactive sputtering was carried out different oxygen flow rates DC target potentials induced RF power. thickness of samples varied between 160 nm 460 nm, depending on preparation conditions. composition refractive index layers investigated energy-dispersive spectroscopy, X-ray photoelectron...
Nanocrystalline Mg 2 Ni powders produced by high energy ball milling (HEBM) were subjected to further severe plastic deformation cold rolling (CR) or equal-channel angular pressing (ECAP). The microstructure of the alloys have been analysed Convolutional whole profile fitting method X-ray line profiles. hydrogenation behavior has studied absorption kinetic measurements.
Abstract Ball-milled nanocrystalline Mg powders catalyzed by TiO 2 powder, titanate nanotubes and carbon were subjected to intense plastic deformation equal-channel angular pressing. Microstructural characteristics of these nanocomposites have been investigated X-ray diffraction. parameters, such as the average crystallite size, dislocation density distance determined modified Williamson–Hall analysis. Complementary hydrogen desorption absorption experiments carried out in a Sieverts’ type...
A Mg65Ni20Cu5Y10 metallic glass was produced by melt spinning and mixed with a 5 wt.% multiwall carbon nanotube additive in high-energy ball mill. Subsequently, the composite mixture exposed to high-pressure torsion deformation different numbers. Complimentary XRD DSC experiments confirmed exceptional structural thermal stability of amorphous phase against severe plastic deformation. Combined high-resolution transmission electron microscopy observations fast Fourier transform analysis...