Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 60: Mechanical Properties: Plasticity, fracture, fatigue, wear - I
MM 60.4: Talk
Thursday, March 19, 2020, 16:30–16:45, IFW B
Uncovering Fundamental Subsurface Deformation Mechanisms in High-Purity Copper Induced by Sliding — •C. Haug1,2, F. Ruebeling1,2, A. Kashiwar3,4, P. Gumbsch1,3,5, C. Kübel3,4,6, and C. Greiner1,2 — 1Karlsruhe Institute of Technology (KIT), IAM, Karlsruhe, Germany — 2KIT IAM-CMS MicroTribology Center — 3KIT, INT — 4Department of Materials and Earth Sciences, Technical University of Darmstadt (TUD), Darmstadt, Germany — 5Fraunhofer IWM, Freiburg, Germany — 6KIT, KNMF
Friction and wear in mechanical systems greatly contribute to global energy consumption. Fundamental studies of the mechanisms governing dislocation mediated plastic deformation and friction at metal sliding interfaces may greatly help expedite the development of materials tailored for low friction and little wear. The present work therefore investigates the microstructural changes induced by sliding in the vicinity of a twin boundary in high-purity copper. The formation of two distinct horizontal line features (dislocation trace lines, DTL) parallel to the sliding interface is observed and their interaction with the twin boundary studied by means of automated crystal orientation mapping (ACOM). Utilizing the twin boundary as a marker, three concurrent fundamental deformation mechanisms are discerned: First, a simple shear process affecting the immediate subsurface area. Second, a localized shear process at the lower DTL. Third, a crystal rotation of the areas between the sliding interface and both DTLs. The three processes are found to exhibit a strong compatibility. Their identification is decisive for guiding future experimental and modeling efforts.