Structure, Chemistry, and Interface of Dispersoids in Powder Metallurgically Processed Ni based 617 ODS Alloy

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Structure, Chemistry, and Interface of Dispersoids in Powder Metallurgically Processed Ni based 617 ODS Alloy

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Author(s): Chanchal Ghosh ¹ ^, ³ ^, , R Mythili ¹ ^, ³ , Arup Dasgupta ¹ ^, ³ , Sudip Kumar Sarkar ² , Deodatta Shinde ² ^, ³ , A Biswas ² ^, ³

Publication date (Electronic): 21 January 2025

Conference name: 13th Asia Pacific Microscopy Congress 2025 (APMC13)

Conference date: 2-7 Febuary 2025

Keywords: Oxide dispersion strengthened alloys, Janus particles, STEM-iDPC, Image simulation, Vacancy ordering

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Abstract

Ni base Alloy 617 super alloy is well-known to the metallurgists and materials scientists owing to solid solution strengthening aided with precipitation strengthening with the formation Ni ₃(Al,Ti) type γ’ precipitates. Interestingly, this alloy system does not undergo any phase transformation upto its melting point and has impressive high temperature strength and oxidation resistance upto about ~ 1000 °C making this alloy system quite attractive for structural applications at elevated temperatures. However, the Ni ₃(Al,Ti) type γ´ precipitates dissolve in the matrix from about 700 °C following which, carbides provides the strength to this alloy system. In order to retain the strength of Alloy 617 upto 1050 °C while maintaining its oxidation resistance properties, this alloy has been conceptualized and developed by powder metallurgical route using fine yttria as (~ 0.6 wt%) dispersoid [ 1]. During the high temperature processing of the material, yttria undergoes solid-state reactions with different alloying elements present in the matrix and form different kinds of dispersoids/ precipitates (terminology maybe debated). Detailed electron-microscopy characterizations including High Angle Annular Dark Field (HAADF) analysis in a probe aberration corrected scanning TEM of the solid state reacted dispersoids/precipitates shows different contrast [ 2]. STEM-HAADF, being a Z ² dependent technique, the contrast difference of the dispersoids is directly related to the composition of the dispersoids. Most exciting finding of the present work is the formation of a bi-phase precipitates resembling as Janus particle comprising Y-Al-O and Al-O. Detailed correlative microscopy analysis including probe aberration corrected differential phase contrast imaging (STEM-iDPC), STEM based tomography and 3D-Atom Probe Tomography (APT) have brought out details about their chemical composition, structure, and a possible mechanism of formation of these bi-phase Janus particles. The studies have also fascinatingly revealed natural methods of the system to minimize interface strain through formation of core-shell structures in some cases.

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Publication date (Electronic): 21 January 2025

Electronic Location Identifier: e147

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[1 ]Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam – 603102, India

[2 ]Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai – 400085, India

[3 ]Homi Bhabha National Institute, Anushaktinagar, Mumbai – 400094, India

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*Corresponding author: chanchal@ 123456igcar.gov.in

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Chanchal Ghosh https://orcid.org/0000-0002-4038-8156

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DOI: 10.14293/APMC13-2025-0147

SO-VID: daf20ecc-cfa6-4fb5-b7dd-c4340401b429

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Published under Creative Commons Attribution 4.0 International ( CC BY 4.0). Users are allowed to share (copy and redistribute the material in any medium or format) and adapt (remix, transform, and build upon the material for any purpose, even commercially), as long as the authors and the publisher are explicitly identified and properly acknowledged as the original source.

Conference name: 13th Asia Pacific Microscopy Congress 2025

Conference acronym: APMC13

Conference number: 13

Conference location: Brisbane, Australia

Conference date: 2-7 Febuary 2025

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M. Sivakumar, S. K. Sinha, A. Dasgupta, S. M. Shaikh, Metallurgical and Materials Transactions A52 (2021) 4974–4986.
S.K. Sinha, A. Dasgupta, M. Sivakumar, C. Ghosh, S. Raju, Microscopy and Microanalysis, (2022) 1–9.

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[1] M. Sivakumar, S. K. Sinha, A. Dasgupta, S. M. Shaikh, Metallurgical and Materials Transactions A52 (2021) 4974–4986.

[2] S.K. Sinha, A. Dasgupta, M. Sivakumar, C. Ghosh, S. Raju, Microscopy and Microanalysis, (2022) 1–9.

Structure, Chemistry, and Interface of Dispersoids in Powder Metallurgically Processed Ni based 617 ODS Alloy

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