Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 61: Nanomaterials - I
MM 61.2: Talk
Thursday, March 19, 2020, 16:00–16:15, IFW D
Elastic and plastic behavior of nanoporous gold under applied electrochemical potential — •Yijuan Wu1, Jürgen Markmann1,2, and Erica Lilleodden1,3 — 1Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany — 2Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 3Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany
The elastic and plastic behavior of nanoporous gold (NPG) under electrochemical potential control at the microscale was investigated by in situ compression testing in an electrolyte using a modified nanoindenter and a novel multiple load function. It was found that the potential dependent flow stress of NPG micropillars showed the same trend as corresponding results of NPG at the macroscale: significant increase at positive potential due to surface coverage of an OH- monolayer and reversible modulation with varying potentials. However, the elastic modulus is insensitive to the applied potential, which is in good agreement with corresponding results from in situ macro-compression experiments, but different to reported results of in situ dynamic mechanical analysis (DMA)