About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Temperature-dependent Intermittent Microplasticity |
Author(s) |
Quentin Rizzardi, Cameron McElfresh, Jaime Marian, Douglas Stauffer, Robert Maass |
On-Site Speaker (Planned) |
Robert Maass |
Abstract Scope |
Statistical investigations of intermittent deformation indicate scale-invariance, which is a paradigm shift away from traditional concepts that rely on well-defined averages. Recently, we have developed an experimental method to trace the spatiotemporal dynamics of correlated dislocation activity that underlies stress-strain discontinuities. These experiments reveal non-trivial scaling behavior (Phys.Rev.Mat. 2 (2018) 120601) and provide rational the transition from intermittent to smooth flow (Phys.Rev.Mat. 3 (2019) 080601). Here we pay attention to the effects of temperature on the statistics of intermittent microplasticity in a bcc metal. We find an excellent agreement between the temperature-dependent stress-strain response at the small and bulk scale. A change of the slip-size distribution is observed, with increasingly small event sizes dominating with decreasing temperature. We trace the effect of temperature on the spatiotemporal velocity profiles of slip that exhibits a distinct temperature sensitivity. We discuss our results in terms of thermally activated plasticity of bcc metal. |
Proceedings Inclusion? |
Planned: |