A5101997420- Metallic Glasses and Amorphous Alloys
- Advanced materials and composites
- High-Temperature Coating Behaviors
- Intermetallics and Advanced Alloy Properties
- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- High Entropy Alloys Studies
- Aluminum Alloys Composites Properties
- Quantum Dots Synthesis And Properties
- Powder Metallurgy Techniques and Materials
- Theoretical and Computational Physics
- Nuclear Materials and Properties
- Glass properties and applications
- Shape Memory Alloy Transformations
- Diverse Approaches in Healthcare and Education Studies
- Quasicrystal Structures and Properties
- Copper Interconnects and Reliability
- Material Science and Thermodynamics
- Environmental Chemistry and Analysis
- melanin and skin pigmentation
- Phase-change materials and chalcogenides
- Non-Invasive Vital Sign Monitoring
- Pigment Synthesis and Properties
- Marine and Coastal Research
- Magnetic Properties and Applications
Korea Institute of Industrial Technology
2010-2024
Andong National University
2011
Dankook University
2010
Gwangju Institute of Science and Technology
2001
A series of batch adsorption tests to estimate the biofilm capacity for removal heavy metals (Cu, Pb, and Ni) in wastewater were carried out. The metal sorption results fitted Freundlich isotherm model compare their capacity. change composition EPSs (extracellular polymeric substances) was simultaneously represented by ratio carbohydrate protein (C/P) when exposed metals. EPS composed slime loosely bound cell capsular materials extracted four general extraction methods including regular...
We report the methods increasing both strength and ductility of aluminum alloys transformed from amorphous precursor. The mechanical properties bulk samples produced by spark-plasma sintering (SPS) Al-Ni-Co-Dy powders at temperatures above 673 K are significantly enhanced in-situ crystallization nano-scale intermetallic compounds during SPS process. spark plasma sintered Al84Ni7Co3Dy6 specimens exhibit 1433 MPa compressive yield 1773 maximum together with 5.6% plastic strain, respectively....
Silver–tin oxide (Ag–SnO 2 ) is considered to be an effective alternative silver–cadmium (Ag–CdO), which carcinogenic and, therefore, toxic the human body. In this study, Ag–SnO powder was prepared through a combined oxidation and ball‐milling process using gas‐atomized Ag–Sn powder. During oxidation, Ag 3 Sn phase disappeared at 800°C SnO formed without oxidation; layer structure that covered matrix. The thickness of increased after composite subjected second process. Owing resultant core...
The W/Cu binary system is characterized by its mutual insolubility and excellent wettability, making composite materials ideal for managing thermal electrical properties in electronic components. To optimize material properties, control over the microstructure crucial, nanocomposites with uniform dispersion offer significant advantages. In this study, nanoparticles were synthesized feeding a blended feedstock of tungsten trioxide (WO3) micro-powder cupric oxide (CuO) into reactive radio...
Cysteine and histidine-capped water-dispersible ZnS:Mn nanocrystals (ZnS:Mn-Cys ZnS:Mn-His) were synthesized their effects on E. coli human cells investigated. Particle sizes of these found from HR-TEM images to be 3.5 nm 4.0 nm, respectively. Their solution photoluminescence spectra showed identical broad emission peaks at 580 nm. ZnS:Mn-His significantly suppressed the growth 1 mg/mL concentrations, something not observed with ZnS:Mn-Cys. Consistent this, greater inhibition cell...
They are expected to replace complicated or hazard ous radioactive detection, and have formed the basis of very sensitive biological assays. In addition, semiconducting nanocrystals much more efficient, stable than organic dyes currently used. Un-fortunately, most highly luminescent semiconductor nanocry-stals grown in non-polar media, making them largely in-compatible with any system. To date, there several reports solubilized hydrophobic water, created by modifying crystals’ surfaces;
Abstract With the discovery of bulk metallic glasses (BMGs), there has been considerable interest in understanding their mechanical behavior. In spite these previous observations on relation between plastic deformation and diffusion behavior, a detailed BMGs is still unexplored. We evaluated contribution deformation-induced structural transformations (elastic, anelastic, viscoplastic or viscoelastic responsive strain) Zr-based as-cast, elastostatically stressed plastically deformed states....
We evaluated the effect of strain on diffusion process amorphous alloys related to mode in both as-cast and plastically deformed Zr-based bulk alloy. Experimental investigations elemental distributions alloy were performed by secondary ion mass spectrometry after annealing at 523 K following 30% plastic deformation multiple cold rolling. Mathematical modeling analyses show an inhomogeneous sequence effective strain. The compressive near surface retards ∼13.7% compared combined experimental...
This study investigated the high temperature oxidation behavior of Fe-22%Cr-5.8%Al alloy and kinetics were discussed. Bulk samples prepared by VAM (vacuum arc melting) hot forging. High testes isothermally conducted up to 100 hours in 79%<TEX>$N_2$</TEX>+21%<TEX>$O_2$</TEX> environment at three different temperatures (<TEX>$900^{\circ}C$</TEX>, <TEX>$1000^{\circ}C$</TEX>, <TEX>$1100^{\circ}C$</TEX>). The weight gain was measured after according time (2, 4, 6, 8, 10, 15, 20, 25, 30, 60, 80,...
The specific feature of multi-component oxides synthesized by hydrothermal process under high temperature (633 K) and highly pressurized water (18.9 MPa) near critical point. Effects processing duration times 24 hours 72 hours, respectively, on the oxide formation Ni59Zr20Ti16Si2Sn3 metallic glass powder metallurgy were characterized X-ray diffractometer, differential scanning calorimeter along with particle size, morphology crystalline phase oxides. crystallization needle-shape NiTiO3,...
Numerical finite element method (FEM) calculation results reveal that the effective strain differs between ductile Zr-based bulk metallic glass and brittle Hf-based (BMG) during rolling at room temperature. The current demonstrated deformation mechanism of can be explained by perceptibility multiple shear bands formation, however, is represented uniformly distribution through overall specimen rather than localized into band. variation stress change significantly near surface region a plate...
At room temperature, metallic glasses deform inhomogeneously by strain localization into narrow bands as a result of yielding due to an external force.When shear are generated during deformation, often nanocrystals form at the bands.Experimental results on deformation bulk glass in current study suggest that occurrence nanocrystallization band implies loading condition induces is more triaxial nature than uniaxial.Under compressive stress state, geometrical constraint imposed triaxiality...
In this study, we optimized dissolution the conditions of porous amorphous powder to have high specific surface area. Porous metallic glass(MG) granules were fabricated by selective phase dissolution, in which brass is removed from a composite consisting MG and 40 vol.% brass. Dissolution was achieved through various concentrations <TEX>$H_2SO_4$</TEX> <TEX>$HNO_3$</TEX>, with <TEX>$HNO_3$</TEX> proving faster reaction kinetics. powders analyzed differential scanning calorimetry observe...
We present variation of the magnetic properties Fe77.8Nb0.2B14P6C2 amorphous alloys vitrified at different temperatures by changing atomic structures dependent on critical cooling rate. The thermophysical state achieved after quenching melt with cold nitrogen atomization gas are compared those obtained using hot a temperature corresponding to supercooled liquid alloy above glass transition (Tg) but below crystallization (Tx). differently glasses represent states high pressure atomized powder...
Abstract We present the synthesis of a bulk nanostructured Mg-based alloy that has grain size less than 300 nm. A Mg-Zn-Cu-Nd with an exceptionally high hardness can be obtained through simultaneous consolidation and in situ crystallization amorphous Mg 84 Zn 7 Cu 3 Nd 6 precursor using spark plasma sintering process. evaluate relationship between microstructure preparation conditions on alloys during The sample produced from sintered at 260 °C is maximized via nanocrystallization...