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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 74: Tribology: Surfaces and Nanostructures (joint session O/CPP)

CPP 74.1: Vortrag

Mittwoch, 18. März 2020, 15:00–15:15, GER 37

Effect of Environment on Microstructure Evolution and Frictional Behavior of Au-Ni Multilayers — •Ebru Cihan^1,2, Heike Störmer³, Katherine Jungjohann⁴, Nicolas Argibay⁵, Michael Chandross⁵, and Martin Dienwiebel^1,6 — 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.