Department of Materials Science and Engineering, Faculty of Engineering
Department of Materials Process Engineering, Graduate School of Engineering
Department of Materials Science and Engineering, Materials Engineering Course, School of Engineering
B.C.C structured metals such as ferritic steels loose their ductility at low temperatures, resulting in brittle fracture. It is termed as ductile-to-brittle transition. In order to understand the mechanism behind the ductile-to-brittle transition, which is essential to obtain further reliability of structural metals, we perform fracture tests in a macroscopic point of view and 3D analysis of lattice defects by using leading-edge electron microscopy. Strength and ductility are compatible in dual-phase materials. We are also aiming to design function rich alloys in terms of understanding the fundamental mechanism behind plastic deformation of hard phase and matrix with a novel method to draw precise marker on the surface of the specimen.