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Fujii-Lei Lab
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The lab studies the microstructure of materials through both experiments and computation in order to design new materials.
AboutAbout the lab
Reading material properties from microstructure.
The Fujii-Lei Lab studies the link between the microstructure and structure of materials and the properties those materials have.
The Fujii Lab quantitatively evaluates how microstructures form and develop inside materials as the environment changes, using electron microscopy and synchrotron X-rays.
The Lei Lab analyzes the functions and mechanical properties that arise from microstructure, based on computational materials science.
Once the mechanisms by which microstructures and structures form are understood, that understanding provides insight for creating new materials.
Key terms
- Dislocation
- A misalignment in the arrangement of atoms in a crystal. A lattice defect that moves when a metal deforms
- Molecular dynamics simulation
- A computational method that calculates the forces acting between atoms and tracks how the atoms move
- Bending rigidity
- A quantity that expresses how hard a material or sheet is to bend
NewsLab news
A paper by a doctoral student was published in Mater. Charact.
A master's student won the Excellent Poster Award at the Young Metallurgist Research Exchange Meeting
A paper by a researcher was published in Mater. Sci. Eng. A
A paper by a researcher was published in Int. J. Fatigue
A master's student won the Branch Chair Award at the Student Research Exchange Meeting of the Kanto Branch of the Society of Materials Science, Japan
ResearchResearch themes
The microstructure and structure of a material always form for some reason, and they are closely tied to the material's physical properties and functions. The Fujii-Lei Lab aims to uncover the mechanisms of this formation through both experiments and computation, and to gain insights for creating new materials.
*Illustrative imageCyclic Deformation and Dislocation Structures
When a metal is repeatedly deformed, dislocation structures form inside it. These structures change with the magnitude of the applied stress and strain, and develop as deformation progresses. The lab observes them with an ultra-high-voltage scanning transmission electron microscope to study how they form.
*Illustrative imageBending Rigidity of Graphene
The lab has developed a method to accurately evaluate the bending rigidity of graphene sheets containing disclinations, combining molecular dynamics simulation with a membrane theory based on differential geometry. The method provides design guidelines for new nanocarbon materials in which the arrangement and density of lattice defects are controlled.
*Illustrative imageCopper Alloys That Are Strong and Conductive
Copper alloys used for wiring in electrical and electronic equipment must have both high strength and high electrical conductivity. Adding other elements makes them stronger but lowers their conductivity, so the lab is exploring microstructure control methods based on thermodynamics and phase equilibrium theory.
*Illustrative imageMaking Nanosprings
The lab has proposed a method to design nanosprings by introducing dislocation dipoles into carbon nanotubes. By finely controlling the type, density, and arrangement of the dislocation dipoles, it showed for the first time that both the spring constant and the shape can be tuned at the same time.
MembersFaculty
The Fujii-Lei Lab's members consist of faculty, a secretary, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorToshiyuki FujiiPublications ↗
- Associate ProfessorLei Xiao-WenPublications ↗
- Assistant ProfessorSukyoung HwangPublications ↗
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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: “EBSD orientation map of ferrous lath martensite” Tiberio / CC BY-SA 4.0 (cropped)
- Cyclic Deformation and Dislocation Structures: “MetalFatigue 006” National Institute of Standards and Technology / Public domain (cropped)
- Bending Rigidity of Graphene: “Neon atoms between graphene sheets ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Copper Alloys That Are Strong and Conductive: “Copper wire, 1 mm thick, 5.5 cm long” Hi-Res Images of Chemical Elements / CC BY 3.0 (cropped)
- Making Nanosprings: “Carbon nanotube (8,8) 3D spacefill” Jynto (talk) / CC0 (cropped)
- Related lab (中田研究室): “Bridge of the Gods October 2019 001” King of Hearts / CC BY-SA 4.0 (cropped)
- Related lab (合田研究室): “Fermi surface of Copper measured with 2D ACAR” Hinkeldörnchen / CC BY-SA 4.0 (cropped)
- Related lab (三宮研究室): “Gold Colloid of varying size” Kumarbarc / CC BY-SA 4.0 (cropped)
- Related lab (邱研究室): “Carbon fibre weave” Christine Twigg / CC BY-SA 4.0 (cropped)
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