Berlin 2018 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 20: Topical session (Symposium MM): Hydrogen in Materials
MM 20.3: Talk
Tuesday, March 13, 2018, 11:00–11:15, H 0107
Tunable elasticity of nanoporous palladium by hydrogen insertion — •Shan Shi1,2, Jürgen Markmann1,2, and Jörg Weissmüller1,2 — 1Institut für Werkstoffforschung, Werkstoffmechanik, Helmholtz-Zentrum Geesthacht, Geesthacht — 2Institut für Werkstoffphysik und -technologie, Technische Universität Hamburg-Harburg, Hamburg
Nanoporous metals with large specific surface area fabricated by dealloying are well-defined model systems for studying the mechanical behavior of nanostructured metals via conventional mechanical testing approaches. It has been demonstrated that mechanical properties such as macroscopic strain and stiffness of nanoporous gold could be tuned via changing the surface state. Most recently, a synthesis protocol for uniform and strong bulk samples of nanoporous Pd has been established. The material is readily equilibrated with H at controlled chemical potential. We have demonstrated that hydrogen electrosorption could result in more than 3% reversible strain variation with np Pd. Here, we explore the elasticity change of np Pd during hydrogen absorption/desorption. It concluded that hydrogen induced over 30% compliance change with np-Pd. Furthermore, the relationship between experimentally measured elastic coefficient and hydrogen content agrees quantitatively with the theory of open system elasticity by Larché and Cahn.