ICAMS, Ruhr-Universität Bochum, Universitätstraße 150, 44780 Bochum, Germany.
Phys Rev Lett. 2019 Nov 8;123(19):195502. doi: 10.1103/PhysRevLett.123.195502.
Recent experiments provide evidence for density variations along shear bands in metallic glasses with a length scale of a few hundred nanometers. Via molecular dynamics simulations of a generic binary glass model, here we show that this is strongly correlated with variations of composition, coordination number, viscosity, and heat generation. Individual shear events along the shear band path show a mean distance of a few nanometers, comparable to recent experimental findings on medium range order. The aforementioned variations result from these localized perturbations, mediated by elasticity.
最近的实验为在数百纳米长度尺度上的金属玻璃中的剪切带中的密度变化提供了证据。通过对通用二元玻璃模型的分子动力学模拟，我们表明这与组成、配位数、粘度和热生成的变化强烈相关。沿着剪切带路径的单个剪切事件显示出几个纳米的平均距离，与最近关于中程有序的实验发现相当。上述变化是由弹性介导的这些局部扰动引起的。
