Effect of Cr addition on the evolution of protective alumina scales and the oxidation properties of a Ta stabilized γ'-strengthened Co-Ni-Al-Mo-Ta-Ti alloy
Source abstract
Abstract
Abstract The paper reports the role of Cr addition (5 and 8 at.%) on the mechanism of oxidation of γ'-strengthened Co-30Ni-10Al-5Mo-2Ta-2Ti(at.%) alloy at 900 °C. The mass gain curves follow parabolic growth for all the three alloys. Cross-sectional studies reveal the formation of (Co1-x,Nix)O phase as an outermost layer. The intermediate layer consists of complex oxides (Co2Mo3O8, NiO6Ta2, CoCr2O4, TiO2, Al2O3) of other alloying elements. The formation of spinel CoCr2O4 with the addition of Cr leads to phase transformation of discontinuous κ-Al2O3 to protective and continuous α-Al2O3. Cr containing alloys show the presence of TiN in the γ' free zone.
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Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · High Temperature Alloys and Creep · High-Temperature Coating Behaviors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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