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.
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The Main Research Topics
Three dimensional analyses on crack tip dislocations by HVEM-tomography
Fundamental mechanism on the brittle-to-ductile transition in crystalline materials
The development of microstructure in rolling process
The effects of microstructure on mechanical properties in dual-phase alloys