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Composite Mechanisms Lab [Joining and Welding Research Institute]
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The lab works to strengthen titanium and other metallic materials and improve their functions, starting from powders and atoms.
AboutAbout the lab
Designing the strength of metals from the atomic perspective.
The Composite Mechanisms Lab researches how to give titanium and other metallic materials high strength and advanced functionality through sintering, in which powder is consolidated, and through metal 3D printing.
It also studies material design that combines carbon nanotubes with metals, and direct joining of dissimilar materials such as titanium and magnesium alloys, or metals and resins.
Beyond experiments, the lab uses first-principles calculations to predict the behavior of atoms and works on building models for predicting strength.
The lab is located at the Joining and Welding Research Institute, Osaka University, and is a cooperating chair of the Department of Mechanical Engineering (Division of Micro Mechanical Science), Graduate School of Engineering.
Key terms
- Sintering
- A process in which powder is pressed and heated to form a single solid mass.
- Solid solution strengthening
- A mechanism that strengthens a metal by dissolving other atoms into its crystal.
- Carbon nanotube
- An extremely thin material in which carbon atoms are linked into a tube shape. It has excellent mechanical, thermal, and electrical properties.
- First-principles calculation
- A computational method that determines the states of atoms and electrons from the laws of physics, without relying on experimental data.
NewsLab news
Master's student wins Outstanding Presentation Award at the Spring Meeting of the Japan Society of Powder and Powder Metallurgy
Doctoral student wins the Graduate Research Encouragement Award of the Society of Automotive Engineers of Japan
Master's student's paper published in the Journal of the Japan Society of Powder and Powder Metallurgy
Master's student's paper published in Materials Transactions
Doctoral student's paper published in the Journal of Alloys and Compounds
ResearchResearch themes
The lab researches how to give titanium and other metallic materials high strength and advanced functionality through sintering and metal 3D printing. In addition to experiments, it uses atomic-scale calculations, and it also works on joining dissimilar materials and on recycling non-edible biomass into resources.
*Illustrative imageHigh strength and high ductility in sintered titanium
The lab aims to increase the strength of sintered titanium by combining approaches such as solid solution strengthening, in which oxygen and nitrogen atoms dissolve into the crystal. It also tests material designs that control the ratio of the crystal's lattice constants to prevent ductility from dropping sharply.
*Illustrative imageStrong titanium materials by metal 3D printing
A laser melts metal powder, which then solidifies rapidly, producing non-equilibrium microstructures, ultrafine structures, and supersaturated solid solutions. To greatly improve mechanical properties, the lab develops new alloy designs and processes.
*Illustrative imageComposite materials using carbon nanotubes
To pass on the excellent mechanical, thermal, and electrical properties of carbon nanotubes to metallic materials, the lab makes composites using a method that disperses the nanotubes individually. By analyzing interface structures and other factors, it clarifies the strengthening mechanism and builds its material design on that understanding.
*Illustrative imagePredicting atomic arrangement and strength by calculation
Using first-principles calculations, the lab predicts how atoms dissolved in a metal crystal become stable, in order to understand how atoms behave in solid solution strengthening. By comparing the results with experiments, it builds models that predict strength.
MembersFaculty
Members of the Composite Mechanisms Lab include faculty members, visiting professors, visiting researchers, project researchers, and students in the doctoral program, the master's program, and the undergraduate program.As of 2026
- ProfessorKatsuyoshi Kondo
- ProfessorJunko Umeda
- LecturerShota Kariya
- Assistant ProfessorAmmarueda Issariyapat
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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: “Material properties of metal powders for use in additive manufacturing ( )” National Institute of Standards and Technology / Public domain (cropped)
- High strength and high ductility in sintered titanium: “Titan-crystal bar” Alchemist-hp (pse-mendelejew.de) / CC BY-SA 3.0 (cropped)
- Strong titanium materials by metal 3D printing: “FZU 3Dprinting 1” René Volfík / CC BY-SA 4.0 (cropped)
- Composite materials using carbon nanotubes: “Types of Carbon Nanotubes” User Mstroeck on en.wikipedia / CC BY-SA 3.0 (cropped)
- Predicting atomic arrangement and strength by calculation: “Redes de Bravais” The original uploader was Angrense at Portuguese Wikipedia. / CC BY-SA 3.0 (cropped)
- Related lab (Microjoining Engineering Lab [Joining and Welding Research Institute]): “Soldering a 0805” Aisart / CC BY-SA 3.0 (cropped)
- Related lab (Energy Conversion Mechanisms Lab [Joining and Welding Research Institute]): “Plasma spraying process” Student-julia-pwr / CC BY-SA 4.0 (cropped)
- Related lab (Process Integration Lab): “SEG DVD 430 - Printed circuit board-4276” Raimond Spekking / CC BY-SA 4.0 (cropped)
- Related lab (Process Metallurgy Lab): “US Army soldier welding two metal pieces, Fort Gregg-Adams, Virginia, March 2025” Juan F. Jimenez, Army / Public domain (cropped)
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