A5047125199- Intermetallics and Advanced Alloy Properties
- Advanced materials and composites
- MXene and MAX Phase Materials
- High Temperature Alloys and Creep
- Microstructure and Mechanical Properties of Steels
- Metal and Thin Film Mechanics
- Semiconductor materials and interfaces
- Metallurgical and Alloy Processes
- Aluminum Alloys Composites Properties
- Aluminum Alloy Microstructure Properties
- Fatigue and fracture mechanics
- Microstructure and mechanical properties
- Metal Alloys Wear and Properties
- Fire effects on concrete materials
- Titanium Alloys Microstructure and Properties
- Electrocatalysts for Energy Conversion
- Nuclear Materials and Properties
- Advanced ceramic materials synthesis
- Metallurgical Processes and Thermodynamics
- Magnetic Properties and Applications
- Catalytic Processes in Materials Science
- Boron and Carbon Nanomaterials Research
- Hydrogen embrittlement and corrosion behaviors in metals
- Anodic Oxide Films and Nanostructures
- Advanced Materials Characterization Techniques
Tohoku University
2016-2025
National Institute for Materials Science
2009-2020
Japan Proton Accelerator Research Complex
2020
Kumamoto University
2020
Innovative Structural Materials Association
2020
Japan Atomic Energy Agency
2020
University of Wisconsin–Madison
2002-2013
Tokyo Institute of Technology
2000-2006
In this study, the ultrahigh-temperature tensile creep behaviour of a TiC-reinforced Mo-Si-B-based alloy was investigated in temperature range 1400-1600 °C at constant true stress. The tests were performed stress 100-300 MPa for 400 h under vacuum, and rupture data rationalized with Larson-Miller Monkman-Grant plots. Interestingly, MoSiBTiC displayed excellent strength relatively reasonable parameters range: time ~400 1400 137 exponent (n) 3 an apparent activation energy (Qapp) 550 kJ/mol....
Microstructures of the two heats Mod. 9Cr-1Mo steel that exhibit comparable creep strength but largely different ductility were analyzed to identify factors can reduce their ductility. The critical difference between microstructures was size and distribution prior austenite grains (PAGs). For heat with higher ductility, PAGs ordinary, approximately 20 µm. In contrast, microstructure low characterized as a mixture regions ordinary-sized extraordinary coarsened several hundred micrometers....
The surface electronic structure and CO-oxidation activity of Pt alloys, Pt3T (T = Ti, Hf, Ta, Pt), were investigated. At temperatures below 538 K, the activities increased in order < Pt3Ti Pt3hHf Pt3Ta. center-of-gravity d-band (the center) was theoretically calculated to follow trend Pt3Ta Pt3Hf Pt. showed a volcano-type dependence on center, where exhibited maximum activity. Theoretical calculations demonstrated that adsorption energy CO catalyst monotonically decreases with lowering...
A platinum-based intermetallic phase with an early d-metal, Pt3Ti, has been synthesized in the form of nanoparticles (NPs) dispersed on silica (SiO2) supports. The organometallic Pt and Ti precursors, Pt(1,5-cyclooctadiene)Cl2 TiCl4(tetrahydrofuran)2, were mixed SiO2 reduced by sodium naphthalide tetrahydrofuran. Stoichiometric Pt3Ti NPs average particle size 2.5 nm formed (particle size: 20−200 nm) atomically disordered FCC-type structure (Fm3̅m; a = 0.39 nm). high dispersivity was achieved...
The austenite reverse transformation behavior in a 1.5Mn-1.5Si-0.2C steel was situ monitored using dilatometry, electron back scatter diffraction (EBSD), X-ray and neutron diffraction. reversion kinetics showed excellent agreements between dilatometry diffraction, whereas the formation observed to start at much higher temperature cases of EBSD measurements. Such discrepancy is attributed change chemical compositions near surface specimen heated elevated temperatures either vacuum (EBSD) or...
The precipitation behavior of M23C6 and Fe2W was investigated in a boron-doped 9%Cr-3%W-3%Co steel during tempering at temperatures from 500 to 790°C. During high temperatures, occurred earlier than Fe2W, but this sequence reversed below 550°C. precipitates formed on PAGBs the lower showed continuous film morphology. film-shaped were stable after aging for least 100 h 650°C.
Design of two-phase alloys consisting niobium solid solution (A2) and α-Nb5Si3 (D8l) phases in the Nb-Ti-Si ternary system is pursued for ultra-high temperature structural applications. Compositional annealing conditions are determined formation A2/D8l lamellar microstructure via eutectoid decomposition Nb3Si (tP32) phase Nb-Si binary system. Addition titanium found to result increased room toughness, but decreased high strength. Enhancement mechanical properties achieved by applying...
Various methods were employed to measure the austenite volume fraction in a 1.5Mn-1.5Si-0.2C steel. It has been confirmed that fractions determined by transmission electron microscopy, scanning microscopy/electron back scatter diffraction, X-ray diffraction and neutron exhibit general trend become larger this order, although values obtained are similar present steel because is relatively stable. The have found be affected measuring specimen direction, i.e., texture, even applying...