| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Entropy Alloys IX: Alloy Development and Properties
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| Presentation Title |
Distinctive Room Temperature Deformation Behavior in Plastic BCC Refractory High-entropy Alloys |
| Author(s) |
Chanho Lee, Gian Song, Michael C Gao, Wei Chen, Ke An, Peter K. Liaw |
| On-Site Speaker (Planned) |
Peter K. Liaw |
| Abstract Scope |
The deformation behaviors for NbTaTiV and NbTaTiVZr high-entropy alloys (HEAs) have been investigated to demonstrate the unique plastic-deformation behavior in plastic body-centered-cubic (BCC)-structured refractory HEAs via the in-depth in-situ neutron study. Both BCC refractory HEAs indicated the simple solid-solution microstructure and excellent single BCC phase stability without the stress-induced phase formation/transformation during plastic deformation. The relatively-brittle NbTaTiVZr HEA presents the typical elastic and plastic deformation behavior of the BCC-structured alloy, exhibiting the elastic and plastic anisotropic feature with the significant load transfer from {110} to {200}-oriented grains during plastic deformation. However, the NbTaTiV HEA shows the elastic isotropic and reduced plastic anisotropic deformation behaviors. These unusual plastic deformation in the NbTaTiV HEA leads to the evenly-sharing applied stresses among the differently-oriented grains rather than stress concentration on particular-oriented grains during plastic deformation. Therefore, the homogenous load-transfer between differently-oriented grains could result in the excellent plasticity (ductility) in BCC-structured refractory HEAs. |
| Proceedings Inclusion? |
Planned: |