A5040984137- High Entropy Alloys Studies
- High-Temperature Coating Behaviors
- Nuclear Materials and Properties
- Advanced Materials Characterization Techniques
- Advanced materials and composites
- Fusion materials and technologies
- Advanced Memory and Neural Computing
- Magnetic and transport properties of perovskites and related materials
- Laser-Ablation Synthesis of Nanoparticles
- Rare-earth and actinide compounds
- Electrowetting and Microfluidic Technologies
- Iron-based superconductors research
- Metallic Glasses and Amorphous Alloys
- Transition Metal Oxide Nanomaterials
- Copper-based nanomaterials and applications
- Magnetic properties of thin films
- Additive Manufacturing Materials and Processes
- Magnetic Properties of Alloys
- nanoparticles nucleation surface interactions
- Graphene research and applications
University of Tennessee at Knoxville
2019-2024
The fabrication of patterned graphene electronics at high resolution is an important challenge for many applications in microelectronics. Here, we demonstrate the conversion positive photoresist (PR), commonly employed commercial manufacture consumer electronics, into laser-induced (LIG). Sequential lasing converts PR photopolymer first amorphous carbon, then to photoresist-derived LIG (PR-LIG). resulting material possesses good conductivity and easily doped with metal or other additives...
Grain growth and phase stability of a nanocrystalline face-centered cubic (fcc) Ni0.2Fe0.2Co0.2Cr0.2Cu0.2 high-entropy alloy (HEA), either thermally- or irradiation-induced, are investigated through in situ post-irradiation transmission electron microscopy (TEM) characterization. Synchrotron lab x-ray diffraction measurements carried out to determine the microstructural evolution with improved statistics. Under TEM observation, fcc structure is stable at 300 °C small amount grain from 15.8...
Microstructure and nanohardness of a nearly equimolar W-Ta-Cr-V high entropy alloy (HEA), as well its irradiation response under He+ irradiation, were investigated. The single-phase body-centered cubic nanostructured with 1 µm thick layer was fabricated on silicon substrate using magnetron sputtering method. HEA film has complex microstructure consisting micrometric domains that exhibit internal nanostructure controlled by their crystal orientation. measured the is 13±2 GPa, which...
Abstract A nanoscale hierarchical dual‐phase structure is reported to form in a nanocrystalline NiFeCoCrCu high‐entropy‐alloy (HEA) film via ion irradiation. Under the extreme energy deposition and consequent thermal dissipation induced by energetic particles, fundamentally new phenomenon revealed, which original single‐phase face‐centered‐cubic (FCC) partially transforms into alternating nanometer layers of body‐centered‐cubic (BCC) structure. The orientation relationship follows...
In the field of radiation damage crystalline solids, new highly-concentrated alloys (HCAs) are now considered to be suitable candidate materials for next generation fission/fusion reactors due recently recorded outstanding tolerance. Despite preliminarily reported extraordinary properties, mechanisms degradation, phase instabilities and decomposition HCAs still largely unexplored fields research. Herein, we investigate response a nanocrystalline CoCrCuFeNi HCA thermal annealing heavy ion...
Ionic liquids (ILs) have been investigated extensively because of their unique ability to form the electric double layer (EDL), which induces high electrical field. For certain materials, low-temperature IL charging is needed limit electrochemical etching. Here, we report our investigation dynamics in two widely used ILs—DEME-TF2N and C4mim-TF2N. Results show that formation EDL at ∼220 K requires several hours relative milliseconds room temperature, an equivalent voltage Ve introduced as a...
Compositionally complex materials (CCMs) present a potential paradigm shift in the design of magnetic materials. These alloys exhibit long-range structural order coupled with limited or no chemical order. As result, extreme local environments exist large variations energy terms, which can manifest changes behavior. In current work, properties (Cr, Mn, Fe, Ni) are presented. were prepared by room-temperature combinatorial sputtering, resulting range compositions single bcc phase and ordering....
Due to the limit in computing power arising from Von Neumann bottleneck, computational devices are being developed that mimic neuro-biological processing brain by correlating device characteristics with synaptic weight of neurons. This platform combines ionic liquid gating and electrowetting for programmable placement/connectivity liquid. In this platform, both short-term potentiation (STP) long-term (LTP) realized via electrostatic electrochemical doping amorphous indium gallium zinc oxide...
In article number 2002652, Lumin Wang and co-workers report that a nanoscale hierarchical dual-phase structure forms in nanocrystalline NiFeCoCrCu high-entropy-alloy film via an ion-irradiation-induced face-centered-cubic (fcc) to body-centeredcubic (bcc) phase transformation. The microstructure of the material is represented top bottom TEM images: five-component high-entropy alloy, before (top) after (bottom) ion-beam irradiation. Atoms are displaced induced “displacement cascade” (as shown...
Abstract In the field of radiation damage crystalline solids -- where new highly-concentrated alloys (HCAs) are suitable candidate materials for next generation fission/fusion reactors outstanding tolerance has been recently recorded. Despite preliminarily reported extraordinary properties, mechanisms degradation, phase instabilities and decomposition HCAs still largely unexplored fields research. Herein, we investigate response a nanocrystalline CoCrCuFeNi HCA to heavy ion irradiation in...