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MM: Fachverband Metall- und Materialphysik
MM 51: Mechanical properties II
MM 51.2: Vortrag
Donnerstag, 19. März 2015, 10:30–10:45, TC 010
microstructure evolution of brass alloys under dry reciprocating tribological loading — •zhilong liu1, philipp messer1, peter gumbsch1,2, and christian greiner1 — 1Karlsruhe Institute of Technology, Institute for Applied Materials, Kaiserstrasse 12, 76131 Karlsruhe, Germany — 2Fraunhofer IWM, Woehlerstrasse 11, 79108 Freiburg, Germany
Correlating a material's microstructure with its friction and wear properties is a central question in tribology. Still, there are many open questions concerning the mechanistic understanding of the microstructure evolution under a tribological load.
Different brass alloys with zinc contents between five and 36% in contact with silicon nitride were used as model tribosystems. Between these alloys, the stacking fault energy varied by more than a factor of five. Starting with an annealed microstructure, we systematically varied the sliding distance and followed the evolution of the microstructure by scanning electron and focused ion beam microscopy. A tribologically deformed layer was observed after the tests, whose thickness increased with the sliding distance. Comparing the results for different brass alloys and those for high-purity copper, an effect of increasing zinc content was observed.
A long term goal of this study is to formulate a mechanistic model description for the microstructural changes in tribological contacts, including the influence of different stacking fault energies in face-centered cubic metals. This might allow for materials with tailored microstructures combing low friction forces and small wear rates.