A5001525442- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Intermetallics and Advanced Alloy Properties
- Metallic Glasses and Amorphous Alloys
- Aluminum Alloys Composites Properties
- Induction Heating and Inverter Technology
- High Temperature Alloys and Creep
- Metal and Thin Film Mechanics
- Additive Manufacturing Materials and Processes
- Magnetic Properties and Applications
- Copper Interconnects and Reliability
- Electrodeposition and Electroless Coatings
- Advanced materials and composites
University of California, Irvine
2022-2024
Irvine University
2022-2024
Single-phase body-centered cubic (bcc) refractory medium- or high-entropy alloys can retain compressive strength at elevated temperatures but suffer from extremely low tensile ductility and fracture toughness. We examined the toughness of a bcc alloy, NbTaTiHf, 77 to 1473 kelvin. This alloy's behavior differed that comparable systems by having over 253 MPa·m
To meet the growing demand for transportation and energy consumption around world, more efficient turbine engines power generators with higher operating temperatures are needed, which require alloys retained strength levels at elevated temperatures. In past decade, refractory complex concentrated (RCCAs) have gained prominence through numerous reports of superior strengths homologous compared to those conventional super alloys. However, these RCCAs, comprised transition metals from subgroups...
The tensile creep behavior of a vacuum arc-melted Nb45Ta25Ti15Hf15 refractory high entropy alloy was investigated over constant true stress range 50-300 MPa at temperature 1173 K. Creep tests were carried out in both (5×10−6 torr) and ultrahigh purity Ar gas to examine the environmental effect. samples tested exhibited power law with exponent 4.1 exceptional ductility, whereas those suffered significant embrittlement due HfO2 formation grain boundaries, which exacerbated low applied stresses...
Magnesium (Mg) alloys are promising lightweight structural materials whose limited strength and room‐temperature ductility limit applications. Precise control of deformation‐induced twinning through microstructural alloy design is being investigated to overcome these deficiencies. Motivated by the need understand twin formation during deformation in Mg alloys, a series magnesium‐yttrium (Mg–Y) using electron backscatter diffraction (EBSD). Analysis EBSD maps produces large dataset...
Abstract For transformers and inductors to meet the world’s growing demand for electrical power, more efficient soft magnetic materials with high saturation polarization resistivity are needed. This work aimed at development of a composite synthesized via spark plasma sintering both cores. CoFe powder particles coated an insulating layer Al 2 O 3 were used as feedstock material improve while retaining polarization. By maintaining continuous non-magnetic phase throughout material,...
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microscopy (TEM), and superconducting quantum interference device (SQUID) magnetometry. XRD revealed a primary phase of Fe 4 N with secondary phases 3 metallic iron. Finite element analysis (FEA) was also applied to investigate explain localized heating temperature distribution during SPS. The effects processing on interface bonding formation evolution were investigated discussed in detail provide insight into fundamental phenomena microstructural SPSed x N. Graphic abstract