A5009354339- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- Advanced ceramic materials synthesis
- Intermetallics and Advanced Alloy Properties
- Electrodeposition and Electroless Coatings
- Titanium Alloys Microstructure and Properties
- Corrosion Behavior and Inhibition
- High-Velocity Impact and Material Behavior
- Aluminum Alloy Microstructure Properties
- High Temperature Alloys and Creep
- Metallurgy and Material Forming
- Electrochemical Analysis and Applications
- Cellular and Composite Structures
- Advanced materials and composites
- Concrete Corrosion and Durability
- Metal and Thin Film Mechanics
- Non-Destructive Testing Techniques
- Microstructure and Mechanical Properties of Steels
- Fusion materials and technologies
- Anodic Oxide Films and Nanostructures
- Magnesium Alloys: Properties and Applications
- Hydrogen embrittlement and corrosion behaviors in metals
- Spacecraft and Cryogenic Technologies
- Gas Sensing Nanomaterials and Sensors
- Material Properties and Applications
Japan Aerospace Exploration Agency
2015-2025
Institute of Space and Astronautical Science
2015-2025
Osaka Prefecture University
2020
Kobe University
2019
Tokyo Metropolitan University
2014-2017
International Society of Automation
2017
Kumamoto University
1993-2015
Nippon Steel (Germany)
2015
Honda (United States)
2014
Ibaraki University
2011-2013
series oxides with perovskite‐type structure were synthesized and examined as the electrode for oxygen evolution reaction in alkaline solution. The except , their neighbors suitable respect to high conductivity. catalytic activity increases along direction from composition. It is concluded that following two conditions are desirable oxide reaction: (i) has a broad band (ii) transition metal cation exists higher oxidation state. In addition, it was found of highest prepared this study.
The electronic and photoelectrochemical properties of the n‐type spinel oxides consisting Zn‐Ti‐Fe are studied. composition systems that give single phase structure and. conductivities former governed by hopping mechanism between Fe2+ Fe3+ at octahedral site, while those latter will be normal band conduction. difference Fermi level bottom energy conduction is determined from activation energies conductivity Seebeck coefficient. Photocurrents observed for almost all samples but disappear in...
Acoustic emission (AE) during a pressure test of carbon fiber-reinforced plastic tank was measured using fiber Bragg grating (FBG) sensor and, for comparison, conventional piezoelectric sensor. The FBG-inscribed optical used not only as an transmission line but also ultrasonic line. FBG showed resonant characteristics and could detect AE continuously the test. detected with exhibited cumulative behavior similar to that demonstrated have comparable detection capability sensors.
The photoelectrochemical properties of the polycrystalline doped with 3d transition metals (Cr, Mn, V, Cu, Ni, and Zn) have been investigated. electrodes Cr, Cu show visible light photoresponses. It is concluded that photoresponse based on impurity band formed near π* conduction in energy position, analogy Co‐doped electrode reported previously. cathodic photocurrent reduction was also observed for undoped electrodes. From good agreement spectral dependences anodic photocurrents, it judged...
Abstract The growing demand for lightweight, heat‐resistant aerospace structures with intricate geometries has driven the integration of non‐oxide ceramics and Ti alloys, addressing inherent workability scalability challenges associated when used independently. Brazing eutectic Ag–Cu‐based fillers emerged as a pivotal technique fabricating reliable joints between these dissimilar materials. This paper provides focused overview strategies to enhance mechanical reliability brazed alloys...
The dependence of the band bending oxide semiconductors on pH have been studied by measuring flatband potential photopotential, and rest dark in solution without redox species. potentials were almost constant with pH, while showed 60 mV/pH dependence. This indicates that only space charge layer bends under state. states held at for , respectively, above phenomenon is based reaction surface state H+ and/or OH− solution. mechanism described detail. enhancement water photolysis catalyst...
The sintering behavior of α‐alumina powders doped with magnesia (500 or 1500 ppm) and yttria (0, 500, was investigated using constant‐heating‐rate dilato‐metric experiments. apparent activation energies for the intermediate stage were 740, 800, 870 kJ/mol 0, ppm doping levels, respectively; these independent doping. Yttria‐doped powder compacts exhibited systematic anomalous second peaks in densification rate curves at certain grain sizes which determined only by levels. Before peak, lower...
This paper reports creep tests on three kinds of polycrystalline hexagonal close-packed metals, i.e. commercially pure titanium, magnesium, and zinc, in the vicinity ambient temperature even below their 0.2% proof stresses. These materials showed significant steady state rates around 10−9 s−1 had stress exponents about 3.0. Arrhenius plots indicate extremely low apparent activation energies, Q, 20 kJ/mol, which is at least one-fourth Q dislocation-core diffusion. Ambient-temperature also has...
Even at ambient temperature or less, below their 0.2% proof stresses all hexagonal close-packed metals and alloys show creep behaviour because they have dislocation arrays lying on a single slip system with no tangled inside each grain. In this case, lattice dislocations move without obstacles pile-up in front of grain boundary. Then these must be accommodated the boundary to continue deformation. Atomic force microscopy revealed occurrence sliding (GBS) ambient-temperature region. Lattice...