Crystal Plasticity and Fracture / Strong Solids Group

Research

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Crystal Plasticity and Fracture / Strong Solids Group

Overview

photo

3D reconstructed image
of crack tip dislocations

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.

Staff

Associate Professor Masaki Tanaka
Assistant Professor Tatsuya Morikawa

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
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