A5027777421- Advanced ceramic materials synthesis
- Advanced materials and composites
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Metal and Thin Film Mechanics
- Bone Tissue Engineering Materials
- nanoparticles nucleation surface interactions
- Additive Manufacturing and 3D Printing Technologies
- Thermal properties of materials
- Advanced Materials Characterization Techniques
- Powder Metallurgy Techniques and Materials
- MXene and MAX Phase Materials
- Injection Molding Process and Properties
- Microstructure and mechanical properties
- Advancements in Solid Oxide Fuel Cells
- Electrodeposition and Electroless Coatings
- Metallic Glasses and Amorphous Alloys
- Aluminum Alloys Composites Properties
- Nuclear materials and radiation effects
- Catalytic Processes in Materials Science
- Advanced Thermoelectric Materials and Devices
- Intermetallics and Advanced Alloy Properties
- Nanotechnology research and applications
- Material Selection and Properties
- Thermal Radiation and Cooling Technologies
Idaho National Laboratory
2020
Colorado State University
2013-2019
Framingham State University
2018
Materials Processing (United States)
2017
University of California, Davis
2004-2013
Flash sintering has attracted significant attention as its remarkably rapid densification process at low furnace temperature leads to the retention of fine grains and enhanced dielectric properties. However, high-temperature mechanical behaviors flash-sintered ceramics remain poorly understood. Here, we present (up 600 °C) in situ compression studies on yttria-stabilized zirconia (YSZ). Below 400 °C, YSZ exhibits high ultimate compressive strength exceeding 3.5 GPa inelastic strain (~8%) due...
Strain hardening capability is critical for metallic materials to achieve high ductility during plastic deformation. A majority of nanocrystalline metals, however, have inherently low work with few exceptions. Interpretations on mechanisms in metals are still controversial due the lack situ experimental evidence. Here we report, by using an transmission electron microscope nanoindentation tool, direct observation dynamic event nickel. During strain stage, abundant Lomer-Cottrell (L-C) locks...
The removal of ultra-thin oxide surface layers on nanometric nickel particles is investigated in the framework electric field-induced dielectric breakdown. In situ transmission electron microscopy was used to directly apply electrical biasing agglomerates nanoparticles during simultaneous imaging contact area between two adjacent particles. applied field initiated breakdown through percolation oxygen vacancies and migration away from particle contact, which leads formation metallic necks...
Superhydrophobic surfaces (i.e., extremely repellent to water) allow water droplets bead up and easily roll off from the surface. While a few methods have been developed fabricate metallic superhydrophobic surfaces, these typically involve expensive equipment, environmental hazards, or multi-step processes. In this work, we universal, scalable, solvent-free, one-step methodology based on thermal sensitization create appropriate surface texture surfaces. To demonstrate feasibility of our...
This study reports the in situ transmission electron microscopy (TEM) observation of pressure-less field-assisted sintering agglomerated nanometric nickel particles. Scanning tunneling inside TEM was used to apply an electrical current directly powder Electrical testing during experiment reveals that consolidation occurs absence external heat source. Neck formation between adjacent particles and attendant increase local Joule heating causes rapid densification. The results represent a first...
To gain fundamental insight into the relationship between length scales and mechanical behaviour, Ni-Fe multilayered materials with a 5-μm-layer thickness modulated grain size distribution have been synthesized by pulsed electrodeposition. Microstructural studies SEM TEM reveal alternating growth of well-defined layers either nano (d = 16 nm) or coarse grains ≥ 500 nm). Room temperature tensile tests performed to investigate response understand underlying deformation mechanisms. Tensile test...
The effect of a dc current on the crystallization Vit1A (Zr42.6Ti12.4Cu11.25Ni10Be23.75) and PCNP (Pd40Cu30Ni10P20) metallic glasses was investigated. Samples were isothermally annealed with without current, at 623 577 K for two glasses, respectively. Small-angle neutron scattering analyses showed that in absence samples amorphous, but imposition enhanced process, increasing both size volume fraction crystallites. Similar general observations seen glass. Differential scanning calorimetry...