Synergistic effect of multimodal γ’ precipitates tuned through Ti addition on phase stability and strength of Co-Ni based superalloy

Mazumder, N and Kumar, D and Singh, MP and Makineni, SK and Mukhopadhyay, NK and Chattopadhyay, K (2023) Synergistic effect of multimodal γ’ precipitates tuned through Ti addition on phase stability and strength of Co-Ni based superalloy. In: Scripta Materialia, 223 .

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Abstract

The paper explores the role of multimodal γ' distribution in a CoNi-based superalloy on their thermophysical and mechanical properties. Three categories of γ' size distribution as primary, secondary type-1, and secondary type-2 were obtained by varying Ti composition (2, 4, and 6 at.) in a Co-30Ni-7Al-2Nb (at.) alloy. The study reveals an anomaly in primary γ' solvus with an increase in Ti composition that influences the microstructure. The anomaly can be related to the interplay between Nb and Ti composition in the γ'. We report a direct correlation among the nature of γ' distribution, its composition, and the yield strength of the alloys at room and high temperatures.

Item Type:	Journal Article
Publication:	Scripta Materialia
Publisher:	Acta Materialia Inc
Additional Information:	The copyright for this article belongs to Acta Materialia Inc.
Keywords:	Aluminum alloys; Binary alloys; Cobalt alloys; Nickel alloys; Titanium; Yield stress, Atom-probe tomography; Coni-based superalloy; Multi-modal; Ni-based superalloys; Solvus anomaly; Synergistic effect; Three categories; Ti addition; γ' precipitates; �'(l12), Superalloys
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	10 Nov 2022 05:08
Last Modified:	10 Nov 2022 05:08
URI:	https://eprints.iisc.ac.in/id/eprint/77795

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