Projects

There are the outline of our Research projects.

Grant-in-Aid for Scientific Research (S)

Breakthrough toward “second-generation” grain boundary engineering

Bulk properties of polycrystalline materials are significantly affected by grain boundaries. Tadao Watanabe has proposed the concept of grain boundary engineering for providing desirable properties of polycrystalline materials” in 1983 / 1984 on the basis of the structure-dependent grain boundary properties, which is nowadays known to be useful for achieving enhanced bulk properties like creep resistance and corrosion resistance (Fig. 1). As mentioned above, “first generation” grain boundary engineering achieved certain results. However, there still remain some issues to be settled for further establishment of grain boundary engineering: e.g., grain boundary engineering is not commonly applied to the materials with a high stacking fault energy.

　Motivation of this project is to achieve a breakthrough toward “second generation” grain boundary engineering. We will deal with two major issues as follows:

Comprehensive understanding of grain boundary phenomena to strengthen fundamental base of grain boundary engineering

Local mechanical properties near the grain boundary – Understanding Hall-Petch relation on the basis of the interaction between grain boundary and dislocations.
Structure and properties of grain boundaries

Guiding principle for grain boundary control of materials with high stacking fault energy

Head of laboratory	Sadahiro Tsurekawa( Kumamoto University, Faculty of Advanced Science and Technology, Professor )
Collaborative researchers	大村孝仁（国立研究開発法人物質・材料研究機構構造材料研究拠点・副拠点長）小林重昭（足利工業大学工学部・准教授） Dr. Seiichiro II (National Institute for Materials Science)
連携研究者	森園靖浩（熊本大学大学院先端科学研究部・准教授）
研究協力者	山室賢輝（熊本大学工学部技術部・技術専門職員） Pavel Lejček（チェコ科学アカデミー物理研究所・教授） Dmitri A. Molodov（アーヘン工科大学・教授）
Term of project	Academic years 2016－2020 (April 2016 - March 2021)

Innovation in Electromagnetic Science of Materials and Its Application to Practical Materials Processing

　The mechanical and functional properties of materials depend significantly on their microstructure, so it is important to develop optimised microstructures to obtain desired materials properties. Traditionally, thermomechanical treatments have been applied to control microstructures in metallic materials. A new strategy for more precise control of microstructure by the application of a magnetic field during processing has recently been proposed (electromagnetic processing of materials, EPM). Extensive studies have demonstrated the effect of applied magnetic fields on many metallurgical phenomena such as recrystallization, phase transformation and precipitation.