|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Powerful Laser-driven Shock Induced Amorphization
||Shiteng Zhao, Bimal Kad, Eric Hahn, Bruce Remington, Christopher Wehrenberg, Jerry Lasalvia, Karren More, Marc Meyers
|On-Site Speaker (Planned)
Powerful laser energy, once deposited onto the material surface within a short duration, will create strong shock waves that propagate and decay within the targets. Using this powerful tool, the unprecedented regime of deformation, with stresses above tens of GPa and strain rates beyond 10<SUP>6</SUP>s<SUP>-1</SUP> can be achieved. Moreover, the short time scale of the stress wave enables the successful recovery of the brittle solids from high-pressure experiments. In this talk, the shock-induced amorphization of four covalently bonded solids, namely silicon, germanium, boron carbide and silicon carbide, will be discussed. The localized morphology of the amorphized region indicates that shear stresses play a significant role in such a drastic phase transition. It is proposed that the work done by the hydrostatic and deviatoric stresses lower the energy barrier of crystalline-to-amorphous transition. The shock induced temperature effect will be discussed as well. This research is funded by a DOE/SSAA Grant DE-NA0002930.
||Planned: Supplemental Proceedings volume