A5040942742- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Microstructure and mechanical properties
- Fusion materials and technologies
- Nuclear Materials and Properties
- Additive Manufacturing Materials and Processes
- Advanced Materials Characterization Techniques
- Advanced materials and composites
- High-Velocity Impact and Material Behavior
- Metal and Thin Film Mechanics
- Metallic Glasses and Amorphous Alloys
- Non-Destructive Testing Techniques
- Heat Transfer and Boiling Studies
- Material Dynamics and Properties
- Carbon Nanotubes in Composites
- Nuclear materials and radiation effects
- Metallurgical Processes and Thermodynamics
- Fluid Dynamics and Mixing
- Cultural Heritage Materials Analysis
- Graphene research and applications
- Ion-surface interactions and analysis
- Graphite, nuclear technology, radiation studies
- Metal Alloys Wear and Properties
- Graphene and Nanomaterials Applications
- High Temperature Alloys and Creep
National Centre for Nuclear Research
2021-2024
University of Helsinki
2022-2023
University of Isfahan
2018-2019
Islamic Azad University of Shahreza
2018
Payame Noor University
2015-2016
Shahid Beheshti University
2016
The mechanical responses of single crystalline Body-Centered Cubic (BCC) metals, such as molybdenum (Mo), outperform other metals at high temperatures, so much that they are considered excellent candidates for applications under extreme conditions, the divertor fusion reactors. thermomechanical stability temperatures (400-1000$^{\rm o}$C) has also been detected through nanoindentation, pointing towards connections to emergent local dislocation mechanisms related defect nucleation. In this...
Equiatomic NiCoCr solid solutions have been shown by recent experiments and atomistic simulations to display exceptional mechanical properties that suggested be linked nanostructural short-range order (SRO) features may arise from thermal treatments, such as annealing or/and aging. Here we use hybrid Monte Carlo--molecular dynamics gain further insights of effects on the SRO formation well edge dislocation plasticity mechanisms equiatomic face-centered cubic solution. For purpose, utilize...
W and W-based high-entropy alloys (HEAs) are promising candidates for plasma-facing materials in fusion reactors. While irradiation studies on have revealed a tendency helium (He) bubble formation radiation-induced defects, investigations of WTaCrV HEA demonstrated superior radiation resistance, whether under He+ or heavy ion irradiation. To assess material performance conditions relevant to reactors - characterized by fast neutrons gas production from transmutation reactions complex...
High-entropy alloys (HEA) form solid solutions with large chemical disorder and excellent mechanical properties. We investigate the origin of HEA strengthening in face-centered-cubic (fcc) single-phase HEAs through molecular dynamics simulations dislocations, particular, equiatomic CrCoNi, CrMnCoNi, CrFeCoNi, CrMnFeCoNi, FeNi, and, also, Fe0.4Mn0.27Ni0.26Co0.05Cr0.02, Fe0.7Ni0.11Cr0.19. The dislocation correlation length ξ, roughness amplitude Ra, stacking fault widths WSF are tracked as a...
The shear-banding instability in quasistatically driven bulk metallic glasses emerges from collective dynamics, mediated by shear transformation zones and associated nonlocal elastic interactions. It is also phenomenologically known that sharp structural features of bands are typically correlated to the sharpness plastic yielding transition, being predominant commonly studied alloys composed multiple different elements, have very atomic radii. However, opposite limit where elements' radii...
In this work, five different compositions of fcc Ni and NixFe1-x single crystal alloys namely Ni, Ni0.88Fe0.12, Ni0.77Fe0.23, Ni0.62Fe0.38, Ni0.38Fe0.62 were irradiated by 1.5 MeV 58Ni ions at room temperature in a wide fluence range (4 × 1013 to 4 1015 ions/cm2). The role Fe addition on the radiation resistance crystals was studied transmission electron microscopy (TEM), ion channeling technique (RBS/C) nanoindentation techniques. Multi-Step Damage Accumulation analysis revealed...
In this paper, we investigate the influence of Cr on primary radiation damage in Fe-12 at.% with different atomic grain boundaries (GBs). Four GB structures, two twists and symmetric tilt are selected as model structures. The near each α-Fe is simulated using Molecular Dynamics for 9 keV knock-on atoms velocity vectors perpendicular to plane. agreement previous works, results indicate that GBs biased toward interstitials due reduction 'in-cascade' interstitial-vacancy annihilation rates,...
High entropy alloys (HEAs) represent highly promising multicomponent crystals that form concentrated solid solutions (CSSs) and may violate traditional thermodynamic rules of mixing, ultimately leading to excellent physical properties. For a deeper understanding, we investigate seven CSSs, including Co-Cr-Ni-Fe-Mn elements, at experimentally relevant compositions conditions, through molecular simulations, use 1-1 comparisons corresponding glass state characteristics, attained rapid cooling...
Abstract Under plastic flow, multi-element high/medium-entropy alloys (HEAs/MEAs) commonly exhibit complex intermittent and collective dislocation dynamics owing to inherent lattice distortion atomic-level chemical complexities. Using atomistic simulations, we report on an avalanche study of model face-centered cubic (fcc) NiCoCrFeMn NiCoCr chemically aiming for microstructural/topological characterization associated avalanches. The results our simulations reveal a close correspondence...
Face-centered cubic (fcc) high and medium entropy alloys (H/MEAs) have been shown to display superior mechanical properties at low temperatures, but significant improvement of their strength temperatures is required for industrial applications extreme conditions. Recently, it has that the breakthrough MEAs from equiatomic/near-equiatomic non-equiatomic ratios leads strong with good ductility. To design new H/MEAs, we consider two important factors may influence strength: chemical composition...
Graphene is a thin sheet with special properties and complicated mechanical behavior. It’s important to study graphene experimentally theoretically. Stone–Wales defects, cracks atom vacancy are popular defects in carbon allotropes especially graphene. In this paper, residual strain was discussed. At first, stress-strain curve of non-defected obtained using molecular dynamics simulation effect temperature on obtained. Then, four different were considered center sheets. Stress-strain curves...
Graphene is a thin sheet with special properties and complicated mechanical behavior. It’s important to study graphene experimentally theoretically. Stone–Wales defects, cracks atom vacancy are popular defects in carbon allotropes especially graphene. In this paper, effect of center on was discussed. At first, non-defected obtained using molecular dynamics simulation. Comparing result theoretical experimental studies showing good agreements proofing the results. Then, 8 different were...
The structural material discovery for high-temperature irradiation applications such as advanced nuclear reactors is challenging due to the extreme service conditions. To address challenge, current work explored an innovative approach involving a nano oxide dispersion strengthened (ODS) medium-entropy alloy with nanosized grains. We demonstrate efficacy of in ODS-NiCoFe alloy. exhibited twofold enhancement hardness compared softer single-crystal NiCoFe. post-irradiation (Ni2+ ions, 580°C)...