Materials Design Division

Nuclear Materials Science

Eiji AKIYAMA

Prof.Eiji AKIYAMA

  • Assist. Prof. Tomohiko HOJO

Elucidation of Effects of Hydrogen on Material Properties and Design of Environmentally Robust Materials

This laboratory is devoted to study hydrogen embrittlement of structural materials used for constructions, automobiles, nuclear materials and so forth, which is caused by a small amount of absorbed hydrogen. We are investigating the role of hydrogen on mechanical property and hydrogen uptake caused by corrosion. For safety and reliability, we are also working on proposal of evaluation method for hydrogen embrittlement property and on design of environmentally robust materials.
We investigate the effect of hydrogen concentration in metals, metallurgical microstructure and hydrogen uptake from environment on hydrogen embrittlement by means of mechanical tests of hydrogen-charged specimens, thermal desorption analysis, monitoring of hydrogen desorption due to stress/strain induced phase transformation, hydrogen visualization techniques and electrochemical techniques. Furthermore, we aim at developing a novel structure control method utilizing the effect of hydrogen in metals.

structural materials, hydrogen embrittlement, corrosion, electrochemistry, hydrogen
The relationships between fracture stress and diffusible hydrogen content of several high strength steels.

The relationships between fracture stress and diffusible hydrogen content of several high strength steels.

Luminescence of ceramic materials under MeV proton beam irradiation

A tensile test machine in a vacuum chamber equipped with a quadrupole mass spectorometer to monitor hydrogen desorption caused by stress/strain martensitic transformation

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