A5010760022- High Entropy Alloys Studies
- Advanced materials and composites
- High-Temperature Coating Behaviors
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Advanced ceramic materials synthesis
- Advanced Materials Characterization Techniques
- Catalytic Processes in Materials Science
- Intermetallics and Advanced Alloy Properties
- Glass properties and applications
- Thermal properties of materials
- Catalysis and Oxidation Reactions
- Fullerene Chemistry and Applications
- Computational Drug Discovery Methods
- Boron and Carbon Nanomaterials Research
- Magnesium Oxide Properties and Applications
- Silicon Carbide Semiconductor Technologies
- Advanced Electron Microscopy Techniques and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Phase-change materials and chalcogenides
- Electronic and Structural Properties of Oxides
- nanoparticles nucleation surface interactions
- Luminescence Properties of Advanced Materials
- Optical and Acousto-Optic Technologies
- Photonic Crystal and Fiber Optics
University of California, San Diego
2017-2024
United States Naval Research Laboratory
2023-2024
UES (United States)
2020
University of California, Berkeley
2016
Abstract Seven equimolar, five-component, metal diborides were fabricated via high-energy ball milling and spark plasma sintering. Six of them, including (Hf 0.2 Zr Ta Nb Ti )B 2 , Mo (Mo Cr possess virtually one solid-solution boride phase the hexagonal AlB structure. Revised Hume-Rothery size-difference factors are used to rationalize formation high-entropy solid solutions in these diborides. Greater than 92% theoretical densities have been generally achieved with largely uniform...
A high-entropy metal disilicide, (Mo0.2Nb0.2Ta0.2Ti0.2W0.2)Si2, has been successfully synthesized. X-ray diffraction (XRD), energy dispersive spectroscopy (EDX), and electron backscatter (EBSD) collectively show the formation of a single silicide phase. This (Mo0.2Nb0.2Ta0.2Ti0.2W0.2)Si2 possesses hexagonal C40 crystal structure with ABC stacking sequence space group P6222. discovery expands known families materials from metals, oxides, borides, carbides, nitrides to silicide, for first time...
High entropy ultra-high temperature ceramics (HE-UHTCs) have garnered intense research interest due to the potential for optimized oxidation and mechanical properties extreme environment applications. HE-UHTCs are expected oxidize according thermodynamic favorability of their respective reactions, which varies periodic grouping. Based on this, resistance equimolar (metals-basis) group IV + V (HfZrTiTaNb), VI (HfZrTiTaMo) (HfZrTiMoW) carbides borides were evaluated at 1700 °C in 1 mol% O2 5...
This study demonstrates that 20% of a rare-earth (RE) diboride (ErB2) can be stabilized in high-entropy transition metal (TM) diboride, despite the dissimilar chemical properties RE and TM elements large differences lattice parameters ErB2 typical TMB2. However, phase formation depends on fabrication route, which is noteworthy observation. Specifically, single-phase (Ti0.2Zr0.2Hf0.2Ta0.2Er0.2)B2 synthesized via reactive spark plasma sintering (SPS) using elemental boron elements. In...
Five single-phase WB2- and MoB2-containing high-entropy borides (HEBs) have been made via reactive spark plasma sintering of elemental boron metals. A large driving force enables the full dissolution 10-20 mol. % WB2 to form dense, HEBs, including (Ti0.2Zr0.2Hf0.2Mo0.2W0.2)B2, (Ti0.2Ta0.2Cr0.2Mo0.2W0.2)B2, (Zr0.2Hf0.2Nb0.2Ta0.2W0.2)B2, (Zr0.225Hf0.225Ta0.225Mo0.225W0.1)B2; successful fabrication such WB2-containing HEBs has not reported before. In processing science, this result serves...