| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
H-44: Generalized Dislocation Mobility Law for BCC FeCrAl Alloys |
| Author(s) |
Sanjoy Kumar Mazumder, Raven Maccione, Yash Pachaury, Janelle P Wharry, Anter El-Azab, Tomohisa Kumagai |
| On-Site Speaker (Planned) |
Yash Pachaury |
| Abstract Scope |
We aim to construct a generalized mobility law for edge, screw and mixed dislocations in BCC alloys. The mobility of dislocations in BCC alloys is influenced by their relatively open crystal structure and the non-planar nature of the dislocation core. In addition, the presence of solute atoms and clusters act as obstacles to dislocation motion. We have used Molecular Dynamics (MD) simulations to compute the dislocation mobility in FeCrAl alloys at various compositions and temperatures. It was observed that at 300K and an applied shear stress in the range 500-700 MPa, <111>{110} edge dislocations in Fe-13%Cr-5%Al undergo stick and slip motion due to pinning and de-pinning by the solute atoms. This stick and slip motion becomes less significant at higher temperatures and the extent to which this type of motion persists at those temperatures also depends on stress. Our MD data was analyzed and cast into a generalized mobility law. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |