|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Proliferation of Twinning in HCP Metals: Application to Magnesium Alloys
||Dingyi Sun, Mauricio Ponga, Kaushik Bhattacharya, Michael Ortiz
|On-Site Speaker (Planned)
Twinning - a mechanism of lattice reorientation in order to accommodate deformation - is present in many different classes of materials. In particular, twinning plays a crucial role in the deformation of hexagonal close-packed (HCP) materials such as magnesium, a promising basis for the engineering of new lightweight alloys to replace aluminum and steel. To thoroughly understand twinning, we propose a novel systematic framework to predict viable twin modes in any given material. We first kinematically predict all possible twin modes given only basic lattice information. We then consider the energetics of these twin configurations using atomistic simulations and then construct a new magnesium yield surface. The result is the prediction of a set of likely twin modes which is much larger than what previous works of literature have considered. We then discuss the possibility of using these new twin modes to design the next generation of lightweight alloyed materials.
||Planned: Supplemental Proceedings volume