On the role of Ti aiding the protective barrier layer formation for γ�(L12)-strengthened Co-30Ni-10Al-5Cr-2Ta-2/4Ti superalloys

Singh, MP and Mohan Das, S and Gosain, OP and Chattopadhyay, K (2022) On the role of Ti aiding the protective barrier layer formation for γ�(L12)-strengthened Co-30Ni-10Al-5Cr-2Ta-2/4Ti superalloys. In: Corrosion Science, 194 .

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Abstract

The paper reports the influence of Ti on the oxidation behaviour of a new class of low-density L12-strengthened Co-Ni-Al-Ta-Cr-Ti alloys. Oxide scales following the isothermal exposure for 1000 h at 800 °C, 900 °C, and 950 °C were characterized. Contrary to the expectation, increasing Ti content from 2 at Ti to 4 at Ti promotes significant oxidation resistance at all temperatures. The varying amount of Ti does not affect the overall sequence of oxide layers and phase chemistry but does affect the kinetics of the barrier layer formation. Two plausible reasons are discussed for the beneficial effect of Ti addition. © 2021 Elsevier Ltd

Item Type:	Journal Article
Publication:	Corrosion Science
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Alumina; Aluminum alloys; Chromium alloys; Cobalt alloys; Nickel alloys; Oxidation resistance; Scale (deposits); Superalloys; Tantalum alloys; Titanium alloys; Titanium oxides, Barrier layers; Co-based superalloys; Layer formation; Lower density; Oxidation behaviours; Oxide scale; Protective barrier; Ti; �-al2O3; �/γ� co-based superalloy, Aluminum oxide
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Nov 2021 11:38
Last Modified:	22 Nov 2021 11:38
URI:	http://eprints.iisc.ac.in/id/eprint/70525

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