About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Preferential Precipitation on Annealing Twin Boundaries and Its Effect on Strain Localization |
Author(s) |
Semanti Mukhopadhyay, Chaitali Patil, Hariharan Sriram, You Rao, Longsheng Feng, Maryam Ghazisaeidi, Stephen Niezgoda, Yunzhi Wang, Michael Mills |
On-Site Speaker (Planned) |
Semanti Mukhopadhyay |
Abstract Scope |
Annealing twin boundaries (ATBs) in superalloys are vulnerable sites for strain localization and subsequent failure. However, despite several attempts, the role of precipitate-ATB interactions on strain localization in superalloys remains unclear. Thus, we studied γ’ precipitate evolution along ATBs and consequent mechanical behavior in several superalloys.
The present work investigates how various factors contribute to the well-documented strain localization events. For this purpose, we complement results from In-Situ tensile tests with full-field crystal plasticity simulations. Preliminary results indicate that several superalloys exhibit preferential precipitation of γ’ or γ’’ on the ATBs. In this case, local phase transformations at the boundaries influence heterogeneous nucleation on the ATBs. This preferential precipitation also appears to create precipitate-free zones parallel to ATBs, which could exacerbate strain localization. Finally, we will discuss strategies to avoid such intense strain localization events near ATBs based on our analyses. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, Characterization |