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Microstructural changes in CoCrFeMnNi under mild tribological load

Dollmann, Antje; Kauffmann, Alexander; Heilmaier, Martin; Haug, Christian; Greiner, Christian

Abstract:
The lack of a principle element in high-entropy alloys (HEA) leads to unique and unexpected material properties. Tribological loading of metallic materials often results in deformed subsurface layers. As the microstructure feedbacks with friction forces, the microstructural evolution is highly dynamic and complex. The concept of HEAs promises high solid solution strengthening, which might decrease these microstructural changes. Here, we experimentally investigated the deformation behavior of CoCrFeMnNi in a dry, reciprocating tribological contact under a mild normal load. After only a single stroke, a surprisingly thick subsurface deformation layer was observed. This layer is characterized by nanocrystalline grains, twins and bands of localized dislocation motion. Twinning was found to be decisive for the overall thickness of this layer, and twin formation within the stress field of the moving sphere is analyzed. The localization of dislocation activity, caused by planar slip, results in a grain rotation. Fragmentation of twins and dislocation rearrangement lead to a nanocrystalline layer underneath the worn surface. In addition, oxide-rich layers were found after several sliding cycles. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000119943
Veröffentlicht am 23.07.2020
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: 0022-2461, 1573-4803
KITopen-ID: 1000119943
Erschienen in Journal of materials science
Verlag Springer
Band 55
Heft 26
Seiten 12353-12372
Projektinformation TriboKey (EU, H2020, 771237)
Vorab online veröffentlicht am 27.05.2020
Nachgewiesen in Scopus
Web of Science
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