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Tribological performance and microstructural evolution of α-brass alloys as a function of zinc concentration

Liu, Zhilong; Messer-Hannemann, Philipp; Laube, Stephan; Greiner, Christian

Abstract:
Tailoring a material’s properties for low friction and little wear in a strategic fashion is a long-standing goal of materials tribology. Plastic deformation plays a major role when metals are employed in a sliding contact; therefore, the effects of stacking fault energy and mode of dislocation glide need to be elucidated. Here, we investigated how a decrease in the stacking fault energy affects friction, wear, and the ensuing sub-surface microstructure evolution. Brass samples with increasing zinc concentrations of 5, 15, and 36 wt% were tested in non-lubricated sphere-on-plate contacts with a reciprocating linear tribometer against Si$_{3}$N$_{4}$ spheres. Increasing the sliding distance from 0.5 (single trace) to 5,000 reciprocating cycles covered different stages in the lifetime of a sliding contact. Comparing the results among the three alloys revealed a profound effect of the zinc concentration on the tribological behavior. CuZn15 and CuZn36 showed similar friction and wear results, whereas CuZn5 had a roughly 60% higher friction coefficient (COF) than the other two alloys. CuZn15 and CuZn36 had a much smaller wear rate than CuZn5. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120437
Veröffentlicht am 24.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2223-7690, 2223-7704
KITopen-ID: 1000120437
Erschienen in Friction
Verlag SpringerOpen
Projektinformation TriboKey (EU, H2020, 771237)
Vorab online veröffentlicht am 05.06.2020
Schlagwörter brass; tribology; sliding contact; microstructure; stacking fault energy; electron microscopy
Nachgewiesen in Web of Science
Scopus
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