Staffs

  • Eco-Processing Lab
  • Materials Physical Properties Lab
  • Microstructure and Interface Control and Engineering Lab
  • Advanced Materials Processing Lab
  • Environmental Engineering Materials Lab
  • Functional Materials Design Lab

Advanced Materials Lab.

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Prof. Kazuki Takashima, Dr. of Engineering

Mechanical Characteristics of Micro-Sized Materials

A new type of mechanical-testing machine, which is able to apply load directly to a micro-sized specimen for MEMS/NEMS applications, has been developed. We have measured the mechanical properties of an individual micro-constituent(partical) in a material, including a precipitate and the interface between the precipitate and a matrix, using the mechanical-testing machine for micro-sized(nano) materials. This unique technique is useful in the development of high-performance materials.

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Micro-sized(Nano) specimen prepared from thin film.

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Asst. Prof. Mitsuhiro Matsuda, Dr. of Engineering

Microstructural Analysis of Titanium-based, Shape-Memory-Alloy through Transmission-Electron-Microscopy

The micro-structural characterization of various titanium-based, shape-memory alloy's is performed through transmission-electron-microscopy (TEM). Through the use of the HAADF-STEM, which makes it possible to determine the positions of the atomic columns through Z-contrast, we can achieve the microstructure in shape-memory-alloy.

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TEM image of the Ti-50at%Pd melt-spun compound.

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Environmental Engineering Materials Lab.

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Prof. Yoshihito Kawamura, Dr. of Engineering

Development of heat-resistant and high strength KUMADAI-Mg-alloys with LPSO structure

Mg97Zn1Y2 alloys have an 18R-type, long-period, stacking-ordered (LPSO) structure. Mg97Zn1Y2 ingot metallurgy (I/M) alloys showed a high yield strength of 375 MPa and an elongation of 4 % at ambient temperature. Rapid solidified powder metallurgical processing improved the yield strength by 62 % in comparison with the I/M processing, resulting in a high-yield strength of 610 MPa and an elongation of 5 %. The specific yield strength of the alloys was 2-4 times as high as that of the commercial Mg alloys.

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Asst. Prof. Michiaki Yamasaki, Dr. of Engineering

Fabrication of heat-resistant and high strength Al alloys

The quasi-crystalline, icosahedral-phase prevents the Al-matrix-grain-coarsening in the rapidly-solidified, powder-metallurgical Al92.5Fe2.5Ti2.5Cr2.5 alloy alloy due to a thermally stable crystallographic-orientated-relationship between the icosahedral and Al phases. The 2-fold axis of the icosahedral phase is along the <112> axis of face-centered cubic Al; this orientation-relationship was observed in alloys annealed at 573K for 1000h. A highly dispersed, intergranular, icosahedral-phase located on the Al-matrix significantly enhances the heat resistance of the alloys.

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TEM micrographs of the Al-Ti-Fe-Cr RS P/M alloy annealed at 573 K for 1000 h.

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Functional Materials Design Lab.

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Prof. Motohide Matsuda, Dr. of Engineering

Development of functional ceramic materials for environmental protection and energy conversion

The objective of the laboratory is to develop advanced functional ceramic-based materials.  The following projects are in progress:

  • Fabrication of highly-oriented, nano-structured dense films of zeolite and their applications for the environmental protection
  • Development of high-performance materials applicable to low-temperature operating solid oxide fuel cells

The photograph on the right-hand side shows microstructure of bilayered YSZ/SDC electrolyte film fabricated on porous NiO-YSZ composite anode substrate by electrophoretic deposition which is a colloidal process with an accumulation of finely dispersed ceramic powders from suspensions on substrates in a dc electric field.

Research Images

Cross-sectional SEM photograph for bilayered YSZ/SDC electrolyte film fabricated on NiO-YSZ composite substrate for SOFC. The part denoted as LSCF corresponds to cathode in SOFC.

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Asst. Prof. Hiroyuki Yokoi, Dr. of Engineering

Development of New Materials and The Search of Novel Physical Properties Under Extreme Conditions

Development of new techniques for in-liquid synthesis of nano-carbon materials, which are among promising materials for nanotechnology, is conducted. As for single-walled carbon nanotubes (SWNTs), molecular adsorption effects on their electronic properties and high magnetic field properties including Aharonov-Bohm effect and exciton states are investigated. We have also revealed novel double-helical growth of metal silicate tubes in magnetic fields.

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Carbon nanotube by in-liquid synthesis.

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