| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Anisotropic Mobility in Faceted Σ11 <110> tilt FCC Grain Boundaries and the Effect of Subsequent Doping |
| Author(s) |
Megan J. McCarthy, Timothy Rupert |
| On-Site Speaker (Planned) |
Megan J. McCarthy |
| Abstract Scope |
Faceted grain boundaries, where grain boundary area is increased to produce low-energy segments, have been shown to demonstrate new and unexpected migration trends. For example, several faceted boundaries have demonstrated anti-thermal and thermally damped mobility trends. In this work, we use molecular dynamics to demonstrate how faceted Σ11 <110> tilt bicrystal grain boundaries migrate in various FCC metals and also uncover the effect of dopant addition on this motion. In pure metals, a number of these bicrystals exhibit anisotropic mobility, in which boundary migration velocity is dependent on the direction of an applied driving force. One mechanism controlling their mobility is grain boundary dislocation emission. Upon alloying, a critical dopant concentration can alter the ability to create and re-absorb grain boundary dislocations, which introduces mobility anisotropy in several boundaries which were originally isotropic. The discovery of this effect highlights how microscopic boundary structure can influence grain boundary migration. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |