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Kumai-Muraishi Lab
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The lab studies aluminum alloys to create strong and gentle materials for social infrastructure.
AboutAbout the lab
Creating strong and gentle materials for social infrastructure
The Kumai-Muraishi Lab conducts research with the goal of creating strong and gentle materials for social infrastructure.
Centered on aluminum alloys, a representative social infrastructure material, the lab explores the relationships among manufacturing process, microstructure, and mechanical properties.
The lab aims to solve problems facing practical materials and to find seeds for new basic research among them.
Regardless of material type, the lab takes on new themes and is also advancing collaboration with other fields.
Key terms
- Casting
- A processing method in which molten metal is poured into a mold or rolls and solidified into the desired shape
- Precipitation strengthening
- A mechanism that strengthens a metal by dispersing small particles inside it so that it resists deformation
- Dislocation
- A misalignment in the arrangement of atoms in a crystal. Its movement is what allows metals to deform
NewsLab news
Lab information sessions held (online and at Ookayama Campus)
A doctoral student received the Student Excellent Presentation Award from the Japan Foundry Engineering Society
A doctoral student received an award for a poster presentation at the Japan Institute of Light Metals
Professor Emeritus Kumai received the Distinguished Service Award from the Japan Foundry Engineering Society
ResearchResearch themes
The lab explores the relationships among manufacturing process, microstructure, and mechanical properties in metallic materials, a representative class of social infrastructure materials. Faculty and students work together, centered on aluminum and its alloys, which excel in recyclability.
*Illustrative imageUpgrade recycling of aluminum
The lab is developing a vertical high-speed twin-roll casting method that uses aluminum scrap as the starting material to make wrought products such as automobile body panels. Sheets can be produced from molten aluminum at several meters per second, and rapid solidification at rates of up to 1000 K/s yields a finely dispersed microstructure.
*Illustrative imageMultiscale analysis of mechanical behavior
The lab investigates precipitation strengthening, in which small particles hinder dislocation motion and strengthen metals, across multiple hierarchical levels using several types of simulation. Molecular dynamics handles nanoscale interactions, and a dislocation dynamics code developed in the lab handles the mesoscale.
*Illustrative imageStress-orienting effect in polycrystalline materials
When a directional external stress is applied to precipitates formed through phase transformation, only specific variants increase or are suppressed. The lab verifies this stress-orienting effect using electron microscopy, nanoindentation, and micropillar compression tests.
MembersFaculty
The members of the Kumai-Muraishi Lab consist of faculty, emeritus professors and researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorShinji MuraishiPublications ↗
- Assistant ProfessorHiroyuki DannoshitaPublications ↗
VoicesStudent voices
Compiled from answers by students who were in the lab. Ratings and reviews reflect individual students' experiences, not the lab's official views.
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On a 4-point scale, ● marks where students' answers fall
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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: “Aluminium metal pieces” W. Oelen / CC BY-SA 3.0 (cropped)
- Upgrade recycling of aluminum: “Aluminium melting crucible casting process” Rosebudz92 / CC BY-SA 4.0 (cropped)
- Multiscale analysis of mechanical behavior: “Soapbubbles1b” TimothyPilgrim / CC BY-SA 3.0 (cropped)
- Stress-orienting effect in polycrystalline materials: “Proba rozciagania aluminium probka 2” Andrzej Otrębski / CC BY-SA 3.0 (cropped)
- Related lab (中田研究室): “Bridge of the Gods October 2019 001” King of Hearts / CC BY-SA 4.0 (cropped)
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小林研究室): “Gas Turbine 4” Pro-Per Energy Services / CC BY-SA 4.0 (cropped) - Related lab (森川研究室): “Flir E8-Thermal imaging camera-Thermographic camera-03ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Related lab (バッハ研究室): “EFluor Nanocrystal Vials” Travis.jennings / CC BY 3.0 (cropped)
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