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Graduate School of Science and Engineering
Mechanical Engineering

Metallic Materials Science Laboratory

Explore the new materials through grain boundary engineering



Telephone : +81-774-65-6406
Office : YM-125
Database of Researchers

Motohiro YUASA
[Assistant Professor]

Telephone : +81-774-65-7078
Office : YM-122
Database of Researchers

Research Topics

  • Mechanical properties of ultrafine grained materials fabricated by severe plastic deformation.
  • Fabrication of nanocrystalline metal matrix composite by electrodepostion
  • Studies on properties of grain boundaries by model bicrystal

Research Contents

Metallic materials are generally polycrystalline materials consisting of many grains with a different crystallographic orientation. Our research group is focusing on the grain boundaries related phenomena such as grain boundary corrosion, intergranular fracture and grain boundary sliding. Furthermore, we intensely studies severe plastic deformation technique as a method to produce ultrafine grain materials with an average grain size smaller than one micron. Following are our main themes.
I. Studies on Grain Boundary Structures and Related Phenomena
  1. Studies on corrosion fatigue of high-purity copper bicrystals
  2. Molecular dynamics simulation of grain boundary structure and energy
  3. Characterization of grain-boundary triple-junction in pure copper
  4. Measurement of intergranular corrosion potential by scanning vibrating electrode technique.
  5. Characterization of grain boundary in segregated bicrystals

II. Ultrafine grain (UFG) materials by severe plastic deformation
  1. Corrosion behavior of UFG copper and aluminum
  2. Stress corrosion cracking of ultrafine grain copper and brass
  3. Effect of purity and stacking fault energy on the stability of ultrafine grain structures.
  4. Deformation structures of copper single crystals during ECAP
  5. Application of ECAP to processing of ferritic stainless steels sheets to control the texture and formability
  6. Properties of UFG magnesium alloys fabricated by ECAP

III. Harmonic-structured materials by mechanical milling and sintering process
  1. Ti-Al based high temperature material with harmonic structure
  2. Harmonic-structured Mo-Cu composite with high thermal conductivity and low coefficient of thermal expansion
  3. Strengthening mechanism of harmonic-structured Al-Cu alloy

IV. Fabrication and properties of nanocrystalline materials
  1. Properties of nanocrytalline materials processed by electrodeposition
  2. Fabrication of nanocrystalline metals matrix composites by electro co-deposition


  • Single crystal
  • Bicrystal
  • Nanocrystal
  • Crystal grain boundary
  • Grain boundary energy

  • Corrosion
  • Stress corrosion cracking (SCC)
  • Corrosion fatigue
  • Deformation behavior