Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Mechanical Properties

MM 5.8: Vortrag

Montag, 1. April 2019, 12:15–12:30, H46

Electro-chemo-mechanical coupling of nanoporous gold at the microscale — •Yijuan Wu1, Jürgen Markmann1,2, and Erica Thea Lilleodden1,31Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany — 2Institute of Materials Research and Technology, Hamburg University of Technology, Hamburg, Germany — 3Institute of Advanced Ceramics, Hamburg University of Technology, Hamburg, Germany

The effect of variation of electrode potential on the micro-mechanical behavior of nanoporous gold (NPG) was investigated by in situ micro-compression in an electrochemical environment. Micro-pillars of NPG were produced by focused ion beam milling and then mechanically tested in an electrolyte using a nanoindenter equipped with a flat punch. Using a novel loading profile, the contribution to the measured displacement due to the actuation could be decoupled from the compression-induced deformation. The electro-chemo-mechanical coupling resulted in a considerable increase in the strength of the pillars when surface adsorption occurred, i.e. under positive applied potential, and the stress response to potential jumps was found to be fast and reversible.

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