About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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High Entropy Alloys VIII
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Presentation Title |
Unique Elastic and Plastic Deformation Behavior of a Ductile Refractory High-entropy Alloy at Room and Elevated Temperatures |
Author(s) |
Chanho Lee, Gian Song, Yi Chou, George Kim, Wei Chen, Ke An, Yi-Chia Chou, Peter K. Liaw |
On-Site Speaker (Planned) |
Peter K. Liaw |
Abstract Scope |
In order to concretely verify the deformation behaviors of BCC refractory HEAs, numerous efforts have been made, such as the investigation on elastically-isotropic deformation and excellent room-temperature ductility, using computational simulations. However, these predictions of elastic and plastic deformation behavior are still under discussion, due to the lack of experimental verifications. In this study, we have investigated the elastic-deformation behavior of a single BCC NbTaTiV refractory HEA at elevated temperatures, using integrated in-situ neutron-diffraction experiments, density functional theory (DFT) calculations. The single-crystal elastic moduli were determined from the diffraction elastic moduli, using the Kroner model. The type of mobile dislocation as a function of macrostrains are quantitatively calculated and predicted by Williamson-hall plot profile modeling. It is found that the edge dislocations can be the dominant mobile dislocation type for the BCC refractory HEAs during plastic deformation. The type of dominant mobile dislocation was further examined by transmission-electron-microscopy (TEM). |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |