About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Mechanical Behavior at the Nanoscale VII
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Presentation Title |
Healing of Nano-cracks in Metals Induced by Microstructure Evolution |
Author(s) |
T Duong, A Molkeri, C M Barr, A Srivastava, K Hattar, B Boyce, Michael J. Demkowicz |
On-Site Speaker (Planned) |
Michael J. Demkowicz |
Abstract Scope |
In polycrystalline metals, applied loads may cause the microstructure to evolve, e.g., through grain boundary migration, martensitic transformations, or differential distortion. Microstructural evolution, in turn, generates complex stress fields, which give rise to counterintuitive behavior of nanoscale cracks, such as closure under applied mode I (tensile) loading. This talk will present atomistic and continuum-level simulations of stresses induced at a triple junction during mechanically-driven grain boundary migration and their effect on the behavior of a nearby nano-scale crack. The simulations will be compared with corresponding experiments, which demonstrate closure and healing of fatigue-induced nano-cracks in polycrystalline Pt. We will discuss the consequences of this phenomenon for fatigue response. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Modeling and Simulation, |