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Kobayashi Lab
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The lab creates titanium and aluminum alloys for use in biomaterials and transportation equipment.
AboutAbout the lab
Designing functional metallic materials and evaluating their properties from multiple perspectives.
The Kobayashi Lab studies the design of metallic materials with outstanding functionality and the evaluation of their properties.
Building on the fundamentals of materials science, such as phase stability, thermodynamics, and crystallography, the lab layers on forming processes, heat treatment, and microstructure control techniques.
The lab develops titanium alloys, aluminum alloys, magnesium alloys, copper alloys, and composite materials, and evaluates their properties from multiple perspectives according to the intended application.
The materials created this way are expected to be useful as biomaterials, materials for transportation equipment, and materials for electronic devices.
Key terms
- Precipitate
- A small particle that forms inside a metal when part of its composition appears as a separate crystal. It affects the metal's hardness and workability.
- Microstructure control
- Using processing and heat treatment to adjust the size, shape, and arrangement of crystal grains and precipitates in a material as desired.
- Elastic modulus
- A value indicating how resistant a material is to deformation when force is applied. Also called Young's modulus.
ResearchResearch themes
The lab develops functional metallic materials such as titanium alloys, aluminum alloys, and copper alloys, and studies how to enhance their properties through microstructure control. It aims for applications as biomaterials and materials for transportation equipment.
*Illustrative imageMicrostructure Control of Aluminum Alloys
The type, size, and shape of precipitates are key factors that determine an alloy's properties. In addition to controlling the precipitate microstructure through heat treatment, the lab proposes a semi-solid forming process in which compressive strain is applied first, followed by pressure casting at a semi-solid temperature, in order to render harmless the iron that mixes in during recycling.
*Illustrative imageLow-Modulus Biomaterials
If fixation devices for fractured bones or artificial hip joints are too stiff, force is not transmitted to the surrounding bone, and the bone becomes fragile. Using β-type titanium alloys made from elements that are harmless to the body, as well as powder metallurgy, the lab aims to develop materials with an elastic modulus close to that of bone.
*Illustrative imagePrecipitates in Al-Mn Alloys
Metals are opaque, so looking at a cross-section alone does not reveal the true shape of precipitates. The lab dissolves only the matrix in boiling phenol to extract the precipitates, and investigates the rectangular shape of plate-like precipitates and the transformation from Al6Mn to α-AlMnSi.
MembersFaculty
The members of the Kobayashi Lab consist of faculty and students in the master's program and undergraduate program.
- Associate ProfessorEquo KobayashiPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Titanium metal” US gov / Public domain (cropped)
- Microstructure Control of Aluminum Alloys: “Microstructure of a stainless steel A961” Djhé / CC BY 4.0 (cropped)
- Low-Modulus Biomaterials: “Root analogue ceramic dental implant vs titanium screw type implant” Logicwhatelse / CC BY-SA 4.0 (cropped)
- Precipitates in Al-Mn Alloys: “Nickel base alloy with” Grzegorz Cios / CC BY-SA 4.0 (cropped)
- Related lab (細田・田原研究室): “Nitinol bueroklammer verbogen” Petermaerki / CC BY-SA 3.0 (cropped)
- Related lab (横田研究室): “Microscopic image of crystals growing from melted sulfur” AlexmarPhoto / CC BY 4.0 (cropped)
- Related lab (竹山・
小林研究室): “Gas Turbine 4” Pro-Per Energy Services / CC BY-SA 4.0 (cropped) - Related lab (平松研究室): “InGaN crystal SEM+CL” FDominec / CC BY 4.0 (cropped)
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