About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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Presentation Title |
Solute Interaction with Dislocation Cores in α-iron: an Atom Scale Experimental Study |
Author(s) |
Maxime Vallet, Estelle Meslin, Michael Walls, Lisa Ventelon |
On-Site Speaker (Planned) |
Maxime Vallet |
Abstract Scope |
Recent in-situ TEM experiments carried out in pure Fe have highlighted an unexpected reappearance of a Peierls mechanism in the temperature range of the dynamical strain aging. The formation of an interaction between screw dislocations and solute atoms (C and N) has been proposed to explain this new mechanism. Recent ab initio calculations from our group have highlighted that this interaction would cause the reconstruction of core dislocations from the usual easy core to the hard core configuration. Until now, no direct evidence of the solute atom effect on dislocation cores has been observed due to the very high spatial resolution required. In this work, we studied the segregation of solute atoms on dislocation cores in pure Fe in order to evaluate the dislocation core atomic structure by coupling atomically resolved HAADF-STEM with electron energy-loss spectroscopy (EELS) and atom probe tomography. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |