KIT | KIT-Bibliothek | Impressum | Datenschutz

On the interplay between microstructure, residual stress and fracture toughness of (Hf-Nb-Ta-Zr)C multi-metal carbide hard coatings

Gopalan, Hariprasad 1; Marshal, Amalraj; Hans, Marcus; Primetzhofer, Daniel; Cautaerts, Niels; Breitbach, Benjamin; Völker, Bernhard; Kirchlechner, Christoph 1; Schneider, Jochen M.; Dehm, Gerhard
1 Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI), Karlsruher Institut für Technologie (KIT)

Abstract:

The development of sputtered coatings with improved hardness-toughness property combination is widely sought after. Multi-element ceramic carbide (Hf-Nb-Ta-Zr)C coatings with excess carbon, synthesized by DC co-sputtering is presented in this study as a promising candidate to achieve this objective. The specific roles of microstructure and residual stress are decoupled in order to understand their influence on the mechanical properties. Extensive mechanical characterization through in situ testing of focused ion beam fabricated microcantilevers and nanoindentation based approaches are adopted to quantitatively separate the effect of residual stresses on the fracture toughness of the (Hf-Nb-Ta-Zr)C coatings. Residual stress free, microcantilever testing in notched and unnotched conditions, in combination with microstructural characterization unambiguously reveals the intrinsic mechanical behavior of coatings, which solely depend on the microstructure. On the other hand, nanoindentation based testing techniques probe the influence of residual stress and microstructure on the measured mechanical properties. The segregation and thickening of carbon-rich clusters, especially to the grain boundaries with increasing deposition temperatures is speculated to lead to substantial degradation in all mechanical properties measured. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000152694
Veröffentlicht am 15.11.2022
Originalveröffentlichung
DOI: 10.1016/j.matdes.2022.111323
Scopus
Zitationen: 5
Web of Science
Zitationen: 4
Dimensions
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2022
Sprache Englisch
Identifikator ISSN: 0264-1275, 0141-5530, 0261-3069, 1873-4197, 1878-2876
KITopen-ID: 1000152694
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Materials and Design
Verlag Elsevier
Band 224
Seiten Art.-Nr.: 111323
Vorab online veröffentlicht am 27.10.2022
Schlagwörter High entropy ceramics, DC sputtering, Fracture toughness, Residual stress, Nanoindentation
Nachgewiesen in Web of Science
Dimensions
Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page