Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Tribology: Surfaces and Nanostructures (joint session O/CPP)
O 69.1: Talk
Wednesday, March 18, 2020, 15:00–15:15, GER 37
Effect of Environment on Microstructure Evolution and Frictional Behavior of Au-Ni Multilayers — •Ebru Cihan1,2, Heike Störmer3, Katherine Jungjohann4, Nicolas Argibay5, Michael Chandross5, and Martin Dienwiebel1,6 — 1Institute for Applied Materials - Computational Materials Science (IAM-CMS), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Institute of Applied Physics, Justus-Liebig University Giessen, 35392 Giessen, Germany — 3Laboratory for Electron Microscopy (LEM), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 4Center for Integrated Nanotechnologies (CINT), Sandia National Laboratories, 87185 Albuquerque, NM, USA — 5Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, 87185 Albuquerque, NM, USA — 6Fraunhofer Institute for Mechanics of Materials (IWM), MicroTribology Center μTC, 79108 Freiburg, Germany
We present results from a systematic investigation of environmental effects on microstructure and frictional behavior of Au-Ni multilayer films of varying interlayer spacing. Multilayer samples were initially analyzed under UHV and it was demonstrated that the interlayer spacing has a strong impact on friction due to the transition in the dominant deformation mechanism near the surface. A newly shear-induced phase, which can be interpreted as an AuNi alloy (60-65 at% Ni in Au) was observed in the tribolayer for thinner samples. Subsequently, experiments were performed in dry-nitrogen and higher friction forces were measured, leading to different microstructure evolution.