| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Manipulating Twin Morphology in Mg Alloys by Varying Solute Concentration |
| Author(s) |
Yang Hu, Vladyslav Turlo, Irene J. Beyerlein, Subhash Mahajan, Enrique J. Lavernia, Julie M. Schoenung, Timothy J. Rupert |
| On-Site Speaker (Planned) |
Yang Hu |
| Abstract Scope |
Twinning is an important deformation mechanism in Mg alloys that often determines their strength and ductility, yet it still remains unclear how solutes interact with twin boundaries and affect twin growth. In this talk, we discuss how twin evolution can be manipulated in Mg and Mg-Al alloys by varying solute composition. Using molecular dynamics, twin embryo growth in Mg-Al alloys with Al concentration varying from 0 to 10 at.% Al, is first explored. We show that solutes are able to alter the preferred twinning direction, while embryo twin length vs. thickness exhibits a power (log-log) dependence for all alloys. Using a newly developed phenomenological model, which emphasizes disconnection propagation on twin boundaries, we explain the log-log dependence of twin size observed in our atomistic simulations. Our work sheds light on the emerging technique of improving Mg alloy properties via construction of twin mesh networks. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |