|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmental Degradation of Multiple Principal Component Materials
||Investigation of Low Temperature Oxidation Behavior of MoNbTaW Thin Films
||Robert Quammen, Paul F. Rottmann, Taohid Bin Nur Tuhser
|On-Site Speaker (Planned)
MoNbTaW is a promising refractory multi-principal element alloy (RMPEA) that has exhibited good high temperature phase stability in vacuum and exceptional high temperature mechanical properties—even surpassing those seen in Ni superalloys. This combination of properties makes this alloy appealing for a variety of high temperature applications. A major hurdle, however, is the need for good environmental stability. RMPEAs are known to have poor oxidation resistance and to date no work has been conducted in regard to the oxidation behavior of MoNbTaW. Therefore, in the current work, in air anneals of sputtered MoNbTaW films in the 200C - 400C range were conducted to study the low temperature oxidation behavior. Subsequent microstructural (SEM and TEM), compositional (EDS and XPS), and mechanical (nanoindentation) characterization were completed. From this a mixed, amorphous oxide scale with increasing thickness with respect to annealing temperature was observed which detrimentally impacted the mechanical properties of the films.