KIT | KIT-Bibliothek | Impressum | Datenschutz

Characterisation of the oxidation and creep behaviour of novel Mo-Si-Ti alloys

Obert, Susanne; Kauffmann, Alexander; Heilmaier, Martin

The oxidation and creep behaviour of novel eutectic-eutectoid Mo-Si-Ti alloys were studied and compared to previously investigated entirely eutectic Mo-20Si-52.8Ti (at%) and eutectoid Mo-21Si-34Ti reference alloys [Schliephake et al. in Intermetallics 104 (2019) 133-142]. While the latter reference alloys showed either outstanding oxidation behaviour in the temperature range of 800 to 1200 °C (eutectic alloy) or reasonable creep resistance (eutectoid alloy), a combination of both was successfully achieved in a Ti-rich alloy variant (Mo-21Si-43.4Ti). The ubiquitous catastrophic oxidation (“pesting”) of Mo-based alloys at 800 °C is suppressed in this alloy and reasonable oxidation resistance at higher temperatures is observed. For the first time, the unexpected oxidation resistance of the alloys exhibiting eutectic volume fractions of more than 50 vol% is rationalised by a systematic deconvolution of mass gain by scale formation and mass loss by evaporation of volatile species. Furthermore, creep is revealed to be based on similar creep mechanisms throughout the alloy series. Therefore, the observed improvement in creep resistance of the pesting-resistant Ti-rich alloy variant over the eutectic alloy is attributed to the decreasing homologous temperature when testing both at 1200 °C.

Open Access Logo

Postprint §
DOI: 10.5445/IR/1000100105
Veröffentlicht am 21.11.2020
DOI: 10.1016/j.actamat.2019.11.045
Zitationen: 14
Web of Science
Zitationen: 11
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Graduiertenkolleg 2561: Materials Compounds from Composite Materials (GRK 2561)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.02.2020
Sprache Englisch
Identifikator ISSN: 1359-6454, 1873-2453
KITopen-ID: 1000100105
HGF-Programm 34.13.02 (POF III, LK 01) Portfolio Material zukünftige Energief.
Erschienen in Acta materialia
Verlag Elsevier
Band 184
Seiten 132–142
Vorab online veröffentlicht am 20.11.2019
Externe Relationen Siehe auch
Nachgewiesen in Web of Science
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page