Cobalt-based γ–γ′ superalloys are novel heat-resistant materials suitable for high-temperature applications, such as components of the turbine engine. These alloys exhibit favorable strength and corrosion resistance at high temperatures owing to the γ–γ′ microstructure, analogous to that of Ni-based superalloys. The aim of this paper is to evaluate the oxidation behavior of basic Co-9Al-9W (at%) and new tungsten-free Co-10Al-5Mo-2Nb (at%) alloys at elevated temperatures. The investigation is concerned with thermogravimetric studies in the temperature range of 40–1200 °C. The oxidized surfaces after high temperature oxidation have been characterized using optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction analysis (XRD).
Thermogravimetric Investigations of Novel γ–γ′ Co-Al-W and Co-Al-Mo-Nb Cobalt-Based Superalloys
Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received January 5, 2018; final manuscript received April 17, 2019; published online May 17, 2019. Assoc. Editor: Vadim V. Silberschmidt.
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Moskal, G., Migas, D., Niemiec, D., and Tomaszewska, A. (May 17, 2019). "Thermogravimetric Investigations of Novel γ–γ′ Co-Al-W and Co-Al-Mo-Nb Cobalt-Based Superalloys." ASME. J. Eng. Mater. Technol. October 2019; 141(4): 041008. https://doi.org/10.1115/1.4043626
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