Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.27: Poster

Tuesday, March 21, 2017, 18:30–20:30, P4

Mechanical stress upon hydrogen absorption in Nb-Fe Films — •Philipp Klose, Magnus Hamm, and Astrid Pundt — Universität Göttingen, Institut für Materialphysik, Friedrich-Hund-Platz 1, 37077 Göttingen

Hydrogen absorption in thin films adhered to rigid substrates results in compressive mechanical in-plane stresses.[1,2,3] These stresses can lead to changes in the material*s properties. While the in-plane film stress increases linearly on the hydrogen content for low hydrogen concentrations, deviations from the linearity appear at the yield stress [3,4]. The yield stress inversely depends on the film thickness.[5] For hydrogen loaded Niobium films, linearity is maintained to 1 H/Nb, for films below 7 nm and mechanical stress of up to -10 GPa is achieved.[5] The yield stress can also be affected by alloying. In this presenation we study the stress-development upon hydrogen loading in niobium-iron (about Nb90-Fe10) films. Films of different thickness were prepared by argon-cathode beam sputtering. Hydrogen loading was performed from the electrolyte using constant current conditions. For these films, stress linearity is found up to at least 40 nm film thickness.

This work is financially supported by the DFG via project PU131/12-1. [1] J. Weissmuller and C. Lemier, Philos. Mag. Lett. 80:6 (2000), [2] S. Wagner and A. Pundt, Appl. Phys. Lett. 92.5 (2008), [3] U. Laudahn et al., JALCOM 1999 ,[4] A. Pundt, et al., Phys. Rev. B 61.15 (2000), [5] Hamm, M., et al. "Achieving reversibility of ultra-high mechanical stress by hydrogen loading of thin films." Applied Physics Letters 106.24 (2015): 243108.