A5028400420- Microstructure and Mechanical Properties of Steels
- Shape Memory Alloy Transformations
- Titanium Alloys Microstructure and Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Metal and Thin Film Mechanics
- Superconducting and THz Device Technology
- Microstructure and mechanical properties
- Intermetallics and Advanced Alloy Properties
- Electronic and Structural Properties of Oxides
- Physics of Superconductivity and Magnetism
- Metal Alloys Wear and Properties
- High Temperature Alloys and Creep
- Semiconductor materials and devices
- Magnetic and transport properties of perovskites and related materials
- Nuclear Materials and Properties
- Ferroelectric and Piezoelectric Materials
- Thermal Radiation and Cooling Technologies
- Corrosion Behavior and Inhibition
- Advanced Materials Characterization Techniques
- Superconductivity in MgB2 and Alloys
- Advanced Thermoelectric Materials and Devices
- Magnetic properties of thin films
- Advanced Battery Technologies Research
- Fatigue and fracture mechanics
- Superconducting Materials and Applications
National Institute for Materials Science
2016-2025
Teikyo University of Science
2025
Anjo Kosei Hospital
2004-2024
Tokyo Teishin Hospital
2023
Tottori University
2019-2021
Research Network (United States)
2020-2021
Government of Japan
2021
Cabinet Office
2021
Kyushu University
2009-2020
The University of Tokyo
1968-2020
A mixed-valence tin oxide, (Sn2+)2(Sn4+)O4, was synthesized via a hydrothermal route. The Sn3O4 material consisted of highly crystalline {110} flexes. material, when pure platinum (Pt) used as co-catalyst, significantly catalyzed water-splitting in aqueous solution under illumination visible light (λ > 400 nm), whereas neither Sn2+O nor Sn4+O2 active toward the reaction. Theoretical calculations have demonstrated that co-existence Sn2+ and Sn4+ leads to desirable band structure for...
We report here the real-space observation of skyrmions and helical magnetic domains in a MnSi nanowire (NW) using Lorentz transmission electron microscopy (LTEM). The NW was thinned to rectangular cross-section by focused-ion beam milling reduce obstructive Fresnel fringes. Helimagnetic domains, imaged as alternating bright dark contrast stripes with an 18 nm period, were observed be spontaneous ground state at 6 K, while hexagonal skyrmion lattice (SkX) domain diameter under normal field...
The Western pattern diet is rich not only in fat and calories but also phosphate. negative effects of excessive calorie intake on health are widely known, the potential harms phosphate poorly recognized. Here, we show mechanism by which dietary damages kidney. When was relative to number functioning nephrons, circulating levels FGF23, a hormone that increases excretion per nephron, were increased maintain homeostasis. FGF23 suppressed reabsorption renal tubules thus raised concentration...
In this study, the substructures and crystallographic features of as-quenched lath martensite in interstitial-free (IF) steel low-carbon (0.2C steel) were investigated using focused ion beam-scanning electron microscopy serial sectioning advanced transmission microscopy. A three-dimensional analysis revealed that morphology so-called lath, smallest structural unit, exhibited a wedge-shaped plate instead ideal shape. The habit plane orientations distributed from (5 7 5)A to (1 1 1)A IF steel,...
A copper(II)-oxide-based exhaust catalyst exhibits better activity than Pt- and Rh-nanoparticle catalysts in NO remediation at 175 °C. Following theoretical design, the CuO is rationally prepared; nanoplates bearing a maximized amount of active {001} facet are arranged interleaved layers. field test using commercial gasoline engine demonstrates ability to remove from small vehicles. Air pollution by automobile becoming global challenge; it not limited developing countries where traffic...
Abstract Self-crack-healing by oxidation of a pre-incorporated healing agent is an essential property high-temperature structural ceramics for components with stringent safety requirements, such as turbine blades in aircraft engines. Here, we report new approach self-healing design containing 3D network activator, based on insight gained clarifying the mechanism. We demonstrate that addition small amount typically doped MnO localised fracture path, selected appropriate thermodynamic...
Microparticles of radioactive cesium (Cs)-bearing silicate glass emitted from the Fukushima Daiichi nuclear power plant were investigated mainly using state-of-the-art energy-dispersive X-ray spectroscopy in scanning transmission electron microscopes. Precise elemental maps particles obtained double silicon drift detectors with a large collection angle X-rays, and qualitative analysis was performed high-resolution microcalorimetry detector. Beside substantial elements (O, Si, Cl, K, Fe, Zn,...
Deformation microstructure of orthorhombic-α" martensite in a Ti-7.5Mo (wt.%) alloy was investigated by tracking local area using scanning electron microscopy, back-scattered diffraction, and transmission microscopy. The as-quenched α" plates contain {111}α"-type I transformation twins generated to accommodate strain from bcc-β martensite. Tensile deformation up level 5% induces {112}α"-type twins. activation twinning mode is reported for the first time β-Ti alloys. analyzed crystallographic...
The effect of tempering on hydrogen trapping in 0.42C-0.30Ti steel was studied by means a hardness test, thermal desorption spectrometry and high resolution transmission electron microscopy. In addition to the coarse undissolved TiC particles, fine particles with volume fraction up 0.22% precipitated during at temperatures above 500°C. Coherent square platelets diagonal length about 2 nm thickness less than 1 550 600°C, acting as reversible traps. Tempering 700°C caused lose their coherency...
The crystal structure of the R-phase was determined by combined use electron diffraction and powder X-ray method. Rietveld method applied for analysis data. belongs to space group P3 is similar that ζ′2 Au–Cd martensite. deviations atomic coordinates from mirror plane P\bar31m are smaller than Au–Cd. convergent beam patterns were also observed discussed with results.
The present study investigated the local arrestability of intergranular crack in high-strength martensitic steel through multi-scale three-dimensional (3D) analysis using X-ray computed tomography and focused ion beam machining (FIB)-scanning electron microscopy (SEM) serial sectioning combined with backscattering diffraction (3D EBSD). Macroscopic demonstrated discontinuous propagation cracks, indicating arrest propagation. An opening displacement each component revealed that resolved...
Intergranular cracks in the uncharged specimen were arrested at low-angle prior austenite grain boundary (PAGB) segments of several micrometers. In contrast, even small, PAGB with sub-micrometer sizes impeded propagation hydrogen-related intergranular crack. At quasi-cleavage crack tip, crystallographic orientation changed abruptly, and deformation microstructures developed, including formation low-energy dislocation structures. A certain degree growth resistance (intrinsic resistance)...
A strain-induced phase transition is one of the noteworthy phenomena in materials science and condensed matter physics. Electrical optical switching via transitions at room temperature applicable to straintronics, which an emerging field focusing on low-energy operation next-generation computing memory devices. While structural magnetic have been extensively investigated, real-space observation these still a considerable challenge. In this study, we investigated textures under uniaxial...