Department of Physics, University of Illinois at Urbana-Champaign, Loomis Laboratory of Physics, 1110 West Green Street, Urbana, Illinois, 61801-3080, USA.
Phys Rev Lett. 2010 Jul 2;105(1):015502. doi: 10.1103/PhysRevLett.105.015502. Epub 2010 Jun 28.
The critical dynamics of dislocation avalanches in plastic flow is examined using a phase field crystal model. In the model, dislocations are naturally created, without any ad hoc creation rules, by applying a shearing force to the perfectly periodic ground state. These dislocations diffuse, interact and annihilate with one another, forming avalanche events. By data collapsing the event energy probability density function for different shearing rates, a connection to interface depinning dynamics is confirmed. The relevant critical exponents agree with mean field theory predictions.
利用相场晶体模型研究了塑性流动中位错雪崩的临界动力学。在该模型中，通过对完美的周期性基态施加剪切力，自然地产生位错，而无需任何特殊的生成规则。这些位错扩散、相互作用并相互湮灭，形成雪崩事件。通过对不同剪切速率下的事件能量概率密度函数进行数据折叠，证实了与界面去钉扎动力学的联系。相关的临界指数与平均场理论预测相符。
