About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
On the Accommodation of Twin Transformations In Metals: Elastic Shielding Mediated by Twin Facets |
Author(s) |
Hi Vo, Darshan Bamney, Rod McCabe, M.M. Schneider, Khanh Dang, M Pettes, Carlos Tomé, Laurent Capolungo |
On-Site Speaker (Planned) |
Hi Vo |
Abstract Scope |
Diffusionless transformations can enable metals to simultaneously exhibit excellent strength and ductility. The efficiency of a transformation lies in balancing the energy dissipated by growing transformed domains and the consequential buildup of internal elastic strain energy in the matrix. The present study examines this duality by quantitatively mapping the mechanical fields at the nanometer scale near the propagation front of a deformation twin under load using in situ straining and patterned probe four-dimensional-scanning-electron-microscopy strain mapping. Cross-examination using an atomistically-informed phase field simulation suggests that the interfaces bounding twin domains can shield the matrix from a large fraction of the transformation-induced strain, thereby significantly lowering the buildup of elastic strain energy induced by twinning. This rationalizes the ubiquitous activation of twinning in metals and sheds new light on the effects of twinning on the evolution of the internal energy landscape during plasticity. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Magnesium, Mechanical Properties |