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Unraveling the Complexity of Nano-Dispersoids in the Oxide Dispersion Strengthened Alloy 617

Published online by Cambridge University Press:  26 May 2022

Shyam Kanta Sinha ,
Arup Dasgupta Open the ORCID record for Arup Dasgupta [Opens in a new window] ,
M. Sivakumar ,
Chanchal Ghosh  and
S. Raju
Shyam Kanta Sinha
Affiliation:
Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
Arup Dasgupta*
Affiliation:
Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
M. Sivakumar
Affiliation:
Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
Chanchal Ghosh
Affiliation:
Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
S. Raju
Affiliation:
Physical Metallurgy Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603 102, India
*
*Corresponding author: Arup Dasgupta, E-mail: [email protected]
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Abstract

Nanocrystalline oxides are mainly responsible for Ni-base oxide dispersion strengthened (ODS) superalloys excellent thermo-mechanical properties. To establish the microstructural correlations between the metallic matrix and various oxide dispersoids, we report here the atomic-scale structure and chemistry of the complex nano-oxide dispersoids. Ultrahigh-resolution Cs-aberration-corrected scanning transmission electron microscopy (STEM) based techniques have been used to resolve nano-dispersoids in the Alloy 617 ODS. These nano-oxides, interestingly, possess a variety of high-angle annular dark-field (HAADF) contrasts, that is, bright, dark, and bi-phases. Both the light and heavy atoms have been found to be present in Y–Al–O complex-oxide nanostructures in varying quantities and forming a characteristic interface with the metallic matrix. In overcoming the limitation of conventional STEM-HAADF imaging, the integrated differential phase-contrast imaging technique was employed to investigate the oxygen atoms along with other elements in the dispersoids and its interface with the matrix. The most intriguing aspect of the study is the discovery of a few atoms thick Al2O3 interlayer (shell) around a monoclinic Y–Al–O core in the Ni-matrix. On the other hand, when the dispersoid is a hexagonal type Y–Al–O complex, the interface energy is already low, maintaining a semi-coherent interface and it was devoid of a shell.

Keywords

analytical electron microscopyatomic structureinterface structureoxidesSTEM-HAADFSTEM-iDPC
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 28 , Issue 5 , October 2022 , pp. 1463 - 1471
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of the Microscopy Society of America

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Footnotes

†

Present Address: Indian Institute of Technology-Madras, Chennai 600 036, India.

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