Low-Density, High-Temperature Co Base Superalloys

Makineni, SK and Singh, MP and Chattopadhyay, K (2021) Low-Density, High-Temperature Co Base Superalloys. In: Annual Review of Materials Research, 51 . pp. 187-208.

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Abstract

Co base superalloys strengthened by coherent L12 ordered γ� precipitate in a disordered face-centered cubic γ matrix represent a new opportunity for high-temperature alloy development. The emergence of alloys with low density and high specific yield strength at elevated temperatures has further energized the research and development efforts in the last 5 years. Initially stabilized by the addition of small amounts of Nb and Ta, these new generations of alloys with multiple alloying additions to form basic quaternary and ternary alloys have steadily expanded the property envelopes to raise hope for a modern class of superalloys with higher-temperature capabilities. This article reviews the work of a vibrant set of researchers across the globe whose findings are constantly unlocking the potential of these alloys. These developments have achieved high-temperature strength (at 870°C) >0.6 GPa, γ� solvus temperature exceeding 1,100°C, and densities between 7.8 and 8.6 g/cm3. Copyright © 2021 by Annual Reviews. All rights reserved.

Item Type:	Journal Article
Publication:	Annual Review of Materials Research
Publisher:	Annual Reviews Inc.
Additional Information:	The copyright for this article belongs to Annual Reviews Inc.
Keywords:	Cobalt alloys; Precipitation (chemical); Ternary alloys, Alloying additions; Co-base superalloys; Elevated temperature; Face-centered cubic; High temperature strength; Research and development; Solvus temperature; Temperature capability, Superalloys
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Sep 2021 09:15
Last Modified:	16 Sep 2021 09:15
URI:	http://eprints.iisc.ac.in/id/eprint/69851

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