KIT | KIT-Bibliothek | Impressum | Datenschutz

A wear-resistant metastable CoCrNiCu high-entropy alloy with modulated surface and subsurface structures

Ren, Yue; Jia, Qian; Du, Yin; Zhou, Qing ; Greiner, Christian ORCID iD icon 1; Hua, Ke; Wang, Haifeng ; Wang, Jian
1 Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS), Karlsruher Institut für Technologie (KIT)

Abstract:

Sliding friction-induced subsurface structures and severe surface oxidation can be the major causes influencing the wear resistance of ductile metallic materials. Here, we demonstrated the role of subsurface and surface structures in enhancing the wear resistance of an equiatomic metastable CoCrNiCu high-entropy alloy (HEA). The CoCrNiCu HEA is composed of a CoCrNi-rich face-centered cubic (FCC) dendrite phase and a Cu-rich FCC inter-dendrite phase. Copious Cu-rich nano-precipitates are formed and distributed uniformly inside the dendrites after tuning the distribution and composition of the two phases by thermal annealing. Although the formation of nano-precipitates decreases the hardness of the alloy due to the loss of solid solution strengthening, these nano-precipitates can be deformed to form continuous Cu-rich nanolayers during dry sliding, leading to a self-organized nano-laminated microstructure and extensive hardening in the subsurface. In addition, the nano-precipitates can facilitate the formation of continuous and compacted glaze layers on the worn surface, which are also beneficial for the reduction of the wear rate of CoCrNiCu. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000148716
Veröffentlicht am 15.07.2022
Originalveröffentlichung
DOI: 10.1007/s40544-022-0606-9
Scopus
Zitationen: 10
Web of Science
Zitationen: 7
Dimensions
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2223-7690, 2223-7704
KITopen-ID: 1000148716
HGF-Programm 43.34.02 (POF IV, LK 01) Hybrid and Functionalized Structures
Erschienen in Friction
Verlag SpringerOpen
Band 10
Heft 10
Seiten 1722–1738
Vorab online veröffentlicht am 09.06.2022
Nachgewiesen in Dimensions
Web of Science
Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page