Department of Physics, University of South Florida, Tampa, Florida 33620, USA.
Phys Rev Lett. 2012 Sep 21;109(12):125505. doi: 10.1103/PhysRevLett.109.125505. Epub 2012 Sep 19.
The evolution of orientation-dependent metastable states during shock-induced solid-liquid phase transitions in crystalline Al is followed using moving window molecular dynamics simulations. The orientation-dependent transition pathways towards an orientation-independent final state Hugoniot include both "cold melting" followed by recrystallization in [110]- and [111]-oriented shock waves and crystal overheating followed by melting in [100] shock waves. The orientation-dependent dynamics take place within a zone that can extend up to hundreds of nanometers behind the shock front.
利用移动窗口分子动力学模拟研究了冲击诱导的晶体 Al 固液相变过程中各向异性亚稳态的演化。各向异性向各向同性最终状态的转变途径包括[110]和[111]取向的冲击波中的“冷熔”和再结晶以及[100]冲击波中的晶体过热和熔化。各向异性动力学发生在冲击波前沿后可延伸数百纳米的区域内。
