A new tungsten-free gamma-gamma ` Co-Al-Mo-Nb-based superalloy

Makineni, SK and Nithin, B and Chattopadhyay, K (2015) A new tungsten-free gamma-gamma ` Co-Al-Mo-Nb-based superalloy. In: SCRIPTA MATERIALIA, 98 . pp. 36-39.

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Abstract

We present the first report of a tungsten-free cobalt-based superalloy having a composition Co-10Al-5Mo-2Nb. The alloy is strengthened by cuboidal precipitates of metastable Co-3(Al,Mo,Nb) distributed throughout the microstructure. The precipitates are coherent with the face-centred cubic gamma-Co matrix and possess ordered Ll(2) structure. The microstructure is identical to the popular gamma-gamma' type nickel-based superalloys and that of recently reported Co-Al-W-based alloys. Being tungsten free, the reported alloy has higher specific proof stress compared to existing cobalt-based superalloys. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	SCRIPTA MATERIALIA
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Cobalt-based superalloy; gamma-gamma ` microstructure; Solvus temperature; Density; Specific yield strength
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	19 Mar 2015 11:34
Last Modified:	19 Mar 2015 11:34
URI:	http://eprints.iisc.ac.in/id/eprint/51019

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