A5004190900- Polish Historical and Cultural Studies
- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Central European Literary Studies
- Manufacturing Process and Optimization
- Fusion materials and technologies
- Advanced Materials Characterization Techniques
- Nuclear Materials and Properties
- High Temperature Alloys and Creep
- Education and Cultural Studies
- Polish-Jewish Holocaust Memory Studies
- Language and Culture
- Intermetallics and Advanced Alloy Properties
- Polish Legal and Social Issues
- Polish Law and Legal System
- Diverse Academic Research Studies
- Additive Manufacturing Materials and Processes
- Mechanical Engineering Research and Applications
- Microstructure and Mechanical Properties of Steels
- Magnetic Properties and Applications
- Theology and Canon Law Studies
- ZnO doping and properties
- Mechanical and Thermal Properties Analysis
- Social Issues in Poland
- Labour Market and Migration
Warsaw University of Technology
2015-2025
Materials Science & Engineering
2020-2023
Faculty (United Kingdom)
2020
University of Warsaw
2020
Culham Science Centre
2014-2017
Culham Centre for Fusion Energy
2014-2017
United Kingdom Atomic Energy Authority
2014-2017
Institute of Plasma Physics and Laser Microfusion
1980-2012
University of Arkansas at Fayetteville
2002
Central Institute for Labour Protection
2000
A body-centered cubic W-based refractory high entropy alloy with outstanding radiation resistance has been developed. The was grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes unique 4-nm lamella-like structure revealed by atom probe tomography (APT). Transmission electron microscopy (TEM) x-ray diffraction show certain black spots appearing after thermal annealing at elevated temperatures. TEM APT analysis correlated second-phase...
In the quest of new materials that can withstand severe irradiation and mechanical extremes for advanced applications (e.g. fission & fusion reactors, space applications, etc.), design, prediction control beyond current material designs become paramount. Here, through a combined experimental simulation methodology, we design nanocrystalline refractory high entropy alloy (RHEA) system. Compositions assessed under extreme environments in situ electron-microscopy reveal both thermal stability...
The phase stability of fcc and bcc magnetic binary Fe-Cr, Fe-Ni, Cr-Ni alloys, ternary Fe-Cr-Ni alloys is investigated using a combination density functional theory (DFT), cluster expansion (CE), (MCE) approaches. Energies, moments, volumes more than 500 alloy structures have been evaluated DFT, the predicted most stable configurations are compared with experimental observations. Deviations from Vegard law in resulting nonlinear variation atomic moments as functions composition, observed....
The Heyd-Scuseria-Ernzerhof (HSE) screened hybrid density functional has been proven to yield lattice constants and energy gaps of semiconductors in better agreement with experiment than standard local semilocal exchange correlation functionals. latter underestimate the band many severely, i.e., case ZnO underestimation amounts 75% experimental value. In this work, we report on structure optimization study electronic gap wurtzite phase performed within density-functional theory using...
The occurrence of segregation in dilute alloys under irradiation is a highly unusual phenomenon that has recently attracted attention, stimulated by the interest fundamental properties as well their applications. fact solute atoms segregate that, according to equilibrium thermodynamics, should exhibit full solubility, significant practical implications, formation precipitates strongly affects physical and mechanical alloys. A lattice Hamiltonian, generalizing so-called 'ABV' Ising model...
Density Functional Theory (DFT), Cluster Expansion and Monte Carlo simulations have been carried out to investigate the short-range ordering in high-entropy alloys Cr–Ta–Ti–V–W system as a function of temperature composition.
A model lattice ab initio parameterized Heisenberg-Landau magnetic cluster expansion Hamiltonian spanning a broad range of alloy compositions and large variety chemical configurations has been developed for face-centered cubic Fe-Ni alloys. The thermodynamic properties the alloys are explored using configuration Monte Carlo simulations over temperature extending well 1000 K. predicted cubic-body-centered coexistence curve, phase stability ordered Fe3Ni, FeNi, FeNi3 intermetallic compounds,...
Abstract Multicomponent systems, termed High Entropy Alloys (HEAs), with predominantly single solid solution phases are a current area of focus in alloy development. Although different empirical rules have been introduced to understand phase formation and determine what the dominant may be these experimental investigation has revealed that many cases their structure is not phase, accurately distinguish stability boundaries. Here, combined modelling approach looks into electronic proposed...
Systematic investigation of phase stability the magnetic fcc Fe-Cr-Mn-Ni system---promising candidate structural materials to replace conventional austenitic steels---has been performed using a combination spin-polarized density-functional theory, cluster expansion, and Monte Carlo simulations. The developed model was able reproduce all known ground states (GSs) in studied system predict new ones with strongly negative formation enthalpy---ternary ${\mathrm{CrMnNi}}_{2}$ quaternary...
Point defects in body-centred cubic Fe, Cr and concentrated random magnetic Fe-Cr are investigated using density functional theory of elasticity. The volume a substitutional atom ferromagnetic bcc Fe is approximately 18% larger than the host atom, whereas antiferromagnetic 5% smaller atom. In an alloy, elastic dipole P relaxation Ω tensors vacancies self-interstitial (SIA) exhibit large fluctuations, with having negative SIA positive volumes. Dipole nearly isotropic across entire alloy...
A new powder production method has been developed to speed up the search for novel alloys additive manufacturing. The technique involves an ultrasonically agitated cold crucible installed at top of a 20 kHz ultrasonic sonotrode. material is melted with electric arc and undergoes pulverization standing wave vibrations. Several different in various forms, including noble metallic glass alloys, were chosen test process. atomized particles showed exceptional sphericity, while output suitable...
Materials with an ultra-low temperature coefficient of resistivity are desired for the and flow sensors in high-precision electronic measuring systems. In this work, Kubo-Greenwood formula, implemented ab initio molecular dynamics simulations, is employed to predict finite-temperature multi-component alloys severe lattice distortion. We observe a tiny change over wide range high-entropy alloys. The invar effect B2 Ni$_{25}$Co$_{25}$(HfTiZr)$_{50}$ Elinvar results from balance between...
Refractory High-Entropy Alloys (RHEAs) are promising candidates for structural materials in nuclear fusion reactors, where W-based alloys currently leading. Fusion must withstand extreme conditions, including i) severe radiation damage from energetic neutrons, ii) embrittlement due to H and He ion implantation, iii) exposure high temperatures thermal gradients. Recent RHEAs, such as WTaCrV WTaCrVHf, have shown superior tolerance microstructural stability compared pure W, but their...
The occurrence of bcc-fcc ($\alpha$-$\gamma$) and fcc-bcc ($\gamma$-$\delta$) phase transitions in magnetic iron stems from the interplay between excitations lattice vibrations. However, this fact has never been proven by a direct dynamic simulation, treating non-collinear fluctuations dynamics atoms, their coupling at finite temperature. Starting large set data generated ab initio simulations, we derive many-body potentials for bcc fcc describing vicinity near perfect positions. We then use...
Configuration entropy is believed to stabilize disordered solid solution phases in multicomponent systems at elevated temperatures over intermetallic compounds by lowering the Gibbs free energy. Traditionally, increment of configuration with temperature was computed time-consuming thermodynamic integration methods. In this work, a new formalism based on hybrid combination Cluster Expansion (CE) Hamiltonian and Monte Carlo simulations developed predict as function from multi-body cluster...
The phase diagram of Al-Li-Cu system in the Al-rich region was determined by means first-principles calculations and statistical mechanics. mixing enthalpies many configurations for different lattices whole were density functional theory simulations to find stable phases convex hull. They fitted with a cluster expansion calculate free energy compositions as function temperature (Al content > 40 at.%) Monte Carlo simulations. It found that ground state part α-Al, θ' (Al2Cu), δ' (Al3Li), δ...