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

Das, SM and Singh, MP and Chattopadhyay, K (2020) 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. In: Corrosion Science, 172 .

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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. © 2020 Elsevier Ltd

Item Type:	Journal Article
Publication:	Corrosion Science
Publisher:	Elsevier Ltd
Additional Information:	Copy right for this article belongs to Elsevier Ltd
Keywords:	Alloying elements; Alumina; Aluminum oxide; Chromium alloys; Cobalt alloys; Molybdenum alloys; Tantalum alloys; Titanium alloys; Titanium dioxide; Titanium nitride, Complex oxides; Cr addition; Cross-sectional study; Intermediate layers; Mass gain; Mechanism of oxidation; Oxidation properties; Parabolic growth, Aluminum alloys
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	05 Nov 2020 10:29
Last Modified:	05 Nov 2020 10:29
URI:	http://eprints.iisc.ac.in/id/eprint/65508

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