About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
On the Mechanism of Cyclic Plastic Accumulation in a Polycrystalline Nickel-Based Superalloy. |
Author(s) |
Rephayah L. Black, Patrick Villechaise, Valéry Vallé, Jean-Charles Stinville |
On-Site Speaker (Planned) |
Rephayah L. Black |
Abstract Scope |
As any material is stressed throughout its fatigue lifetime, plastic deformation accumulates, eventually leading to mechanical failure. Understanding the underlying mechanisms at the microstructural scale that lead to failure allows for more well-informed alloys to be engineered. Using advanced tools, such as high-resolution digital image correlation (HR-DIC) and high-resolution electron backscatter diffraction (HR-EBSD), plastic accumulation can be observed as slip events evolve over the course of thousands of cycles across a large region with further correlation with grain-scale lattice rotation. Of particular interest in this study are significant slip localizations and accumulation that occurred along twin boundaries, of which some formed a stress pile-up known as a ‘microvolume.’ These microvolumes give insight into how stress is concentrated in polycrystalline materials at the grain scale and how to engineer more resilient metals. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Mechanical Properties, Other |