Materials Design Division

Nuclear Materials Science

Eiji AKIYAMA PHOTO
Prof. Eiji AKIYAMA
Assist. Prof. Tomohiko HOJO
   

Effects of hydrogen and irradiation on material properties and their applications for novel measurements and functional materials

This laboratory is devoted to study the effect of hydrogen on metallic material property and dynamic interactions of highenergy particles and radiations with functional materials. We aim at understanding of hydrogen uptake caused by corrosion and hydrogen embrittlement behavior of metals, dynamic irradiation effects in ceramic functional materials and behavior of hydrogen isotope, for reliability of the materials used in the harsh environments.
We investigate hydrogen uptake, effect of hydrogen concentration on hydrogen embrittlement fracture and role of microstructure by means of tensile test of hydrogen-charged specimens, thermal desorption analysis and hydrogen visualization techniques. We also focus on the transport of hydrogen-isotopes used in nuclear fusion reactors. Additionally, we study the migration of protons in proton conducting oxides and polymers for development of advanced fuel-cells.

hydrogen embrittlement, electrochemistry, radiation effects, ion beam, 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

Luminescence of ceramic materials under MeV proton beam irradiation. The specific luminescence is associated with the presence of activator atoms such as transition metals of Eu2+, Mn2+, Cr3+, for blue, yellow and red, respectively.

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