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2019.11.08

【Young Faculty:029】Shoichi NAMBU, Associate Professor, Department of Materials Engineering

Biography
2002.3 BS, Department of Materials Engineering, The University of Tokyo
2004.3 MS, Department of Materials Engineering, The University of Tokyo
2007.3 Dr. Eng. Department of Materials Engineering, The University of Tokyo
2007.4 Postdoctoral Researcher, Department of Materials Engineering, The University of Tokyo
2008.5 Assistant Professor, Department of Materials Engineering, The University of Tokyo
2013.8 Lecturer, Department of Materials Engineering, The University of Tokyo
2019.2 Associate Professor, Department of Materials Engineering, The University of Tokyo


The properties and the microstructures of structural materials are studied in my group. The properties and performances of materials vary greatly depending on the microstructure as well as the constituent elements. Even steels, one of the most familiar materials, can achieve a very wide range of properties by controlling the microstructure.
For example, in order to save energy and reduce CO2 emissions, it is strongly desired to reduce the weight of mobile objects such as automobiles. For this reason, the weight of the structural body has been reduced by improving the strength of the structural materials of mobiles, but not only the strength but also the ductility is important from the viewpoint of formability and collision safety. It is indispensable to develop a structural material that can satisfy both them at a high level. Therefore, in my laboratory, the microstructure of materials is controlled at various scales of nano-, micro-, and macro-, and the performance is significantly improved by forming composites and multilayered structures, while refining the microstructures. Then, we are developing new steels and metallic materials with improved properties. Also, we are researching to clarify and control the nature of the interfaces between dissimilar materials, which is key to joining different materials corresponding to the multi-material structure. As one of them, we proposed multilayered steels consisting of ultra-high strength steel and ductile steel, and multilayered metallic materials consisting of lightweight Mg alloy and ductile steel, and we have achieved innovative materials with ultra-high strength and high ductility that could not be achieved with conventional materials by controlling the properties, the interfacial strength, the volume fraction, the layer thickness, etc.

[References]
S. Nambu, K. Seto, JY. Lin, T. Koseki, Science and Technology of Welding and Joining, 23 (2018) pp.687-692.
S. Nambu, Y. Takizawa, M. Ojima, J. Inoue, and T. Koseki, ISIJ International, 57 (2017) pp.1254-1259.
T. Koseki, J. Inoue and S. Nambu, Materials Transactions, 55 (2014) pp. 227-237.

 

Recycling materials is essential in a future sustainable society. One of the keys to achieve both recycling and multi-materials that is currently required is technology that enables materials to be joined and separated. While pursuing higher performance of structural materials, I would like to propose such a new joint-separation method.

・Nambu Lab.
http://metall.t.u-tokyo.ac.jp/n_index.html