[1E01-03] Environmental Material / Energy Material (SU / EN)

2:30 PM - 2:45 PM JST(5:30 AM - 5:45 AM UTC)

[1E02] Hydrogen-Induced Structural Phase Transition in a PdCu alloy membrane

*Taro Yakabe¹, Yoshiharu Murase¹, Tomoko Kusawake¹, Masahiro Kitajima¹, Kazutaka Mitsuishi¹, Akiko N Itakura¹ (1. National Institute for Materials Science (NIMS) (Japan))

We observed structural changes in PdCu using Electron Backscatter Diffraction before and after long-term hydrogen permeation tests conducted at low hydrogen pressures (200 – 1000 Pa) and low temperatures (373 – 473 K). The experiment demonstrated that a complete structural transition (α + β → β) could be induced under these conditions. We also observed how β-phase domains grew from phase boundaries. The results revealed that the growth occurred predominantly from interfaces that did not conform to established orientation relationships such as Bain, Kurdjumov-Sachs (K-S), Nishiyama-Wassermann (N-W), Pitsch, and Greninger Toiano (G-T) and G-T’). These relationships are typically associated with stable phase boundaries; the observed growth suggests that phase interface migration is driven by hydrogen-induced atomic diffusion.

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