Presentation Information
[1E03]Evaluation of hydrogen permeable membranes using operando hydrogen microscope
*Taro Yakabe1, Naoya Miyauchi1, Yoshiharu Murase1, Takanobu Hiroto1, Tomoko Kusawake1, Masahiro Kitajima1, Kazutaka Mitsuishi1, Akiko N Itakura1 (1. National Institute for Materials Science (NIMS))
Hydrogen, the smallest element, can dissolve and diffuse in metals, allowing some alloys to act as hydrogen filters. PdCu forms α, β, or α+β mixed phases depending on its composition, with the mixed phase showing the highest hydrogen permeability. The exact mechanism for this is unclear. Using operando hydrogen microscopy and EBSD analysis, we studied the relationship between hydrogen permeation and alloy structure. No significant difference in permeability was found between α and β domains or at their boundaries in the mixed phase. However, areas with high KAM values, which relate to dislocation density, showed higher hydrogen permeability. This suggests that increased dislocation density at phase boundaries in the mixed phase enhances hydrogen permeation.