| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Dynamic Behavior of Materials: Experiments and Molecular Dynamics Simulations
|
| Presentation Title |
Shock Compression of Cu<sub>x</sub>Zr<sub>100-x</sub> Metallic Glasses |
| Author(s) |
Peng Wen, Brian Demaske, Simon Phillpot, Douglas E. Spearot |
| On-Site Speaker (Planned) |
Douglas E. Spearot |
| Abstract Scope |
The shock response of Cu<sub>x</sub>Zr<sub>100-x</sub> (x = 30, 50 and 70) metallic glasses (MGs) is simulated using molecular dynamics simulations. Piston velocities from Up = 0.125 to 2.5 km/s are employed, corresponding to shock pressures from 3 to 130 GPa. Different shock wave propagation regimes are observed: (1) single elastic shock wave for Up < 0.25 km/s, (2) split elastic and plastic shock waves for 0.25 < Up < 0.75 km/s and (3) overdriven plastic shock wave for Up > 0.75 km/s. Hugoniot states are dependent on the Cu content with Cu<sub>70</sub>Zr<sub>30</sub> exhibiting the highest resistance to plastic deformation than Cu<sub>50</sub>Zr<sub>50</sub> or Cu<sub>30</sub>Zr<sub>70</sub>. Plastic deformation initiates via formation of shear transformation zones (STZs). At high shock pressures, STZ nucleation leads to shock-induced melting, which is identified via atomic diffusivity. Both the flow stress and the critical shock pressure associated with melting increase with increasing Cu content. |