About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Deformation and Damage Mechanisms of High Temperature Alloys
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Presentation Title |
Preferential Precipitation of γ' on Annealing Twin Boundaries in Superalloys |
Author(s) |
Semanti Mukhopadhyay, Hariharan Sriram, Shakthipriya Basker Kannan, Charles Xu, Ashton Egan, Fei Xue, Longsheng Feng, Richard DiDomizio, Andrew Detor, Katelun Wertz, Milan Heczko, Robert Hayes, Gopal B. Viswanathan, Christopher Zenk, Emmanuelle Marquis, Maryam Ghazisaeidi, Stephen Niezgoda, Yunzhi Wang, Michael Mills |
On-Site Speaker (Planned) |
Semanti Mukhopadhyay |
Abstract Scope |
In several Ni-based superalloys, annealing twin boundaries (ATBs) are susceptible sites for strain localization and subsequent failure. Although attempts have been made to explore this strain localization, the overall mechanistic understanding is still lacking. Moreover, in some Ni and Co-based superalloys investigated in the present study, such strain localization events appear to be further complicated by the presence of γ′ and γ′′ precipitates on all the ATBs. Microstructural characterization has revealed preferential γ′ and γ′′ precipitation on the ATBs. These ATB precipitates exhibit morphology, size, and composition very similar to the precipitates evolving elsewhere in the system. Aberration-corrected STEM-based microstructural study of the ATB precipitates indicates three-layer segregation at the twin boundary within γ′ precipitates. Long-term phase stability of the precipitates and their effect on the mechanical behavior have been evaluated in an IN718-based system using a combination of advanced characterization techniques complemented by phase-field and crystal plasticity modeling. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Phase Transformations, Mechanical Properties |