二元混合物中多晶态的塑性流动
Plastic flow in polycrystal states in a binary mixture
摘要：
使用分子动力学模拟，我们研究动态剪切多晶态的二元混合物中含有10%的大颗粒在两个维度。我们发现大的应力波动所产生的滑动运动的颗粒在晶界，这发生合作释放存储的弹性能量。借助代表局部晶体取向的六倍角$α_j(t)$和代表颗粒$j$偏离六方有序的无序变量$D_j(t)$，这些动态过程被可视化。
英文摘要：
Using molecular dynamics simulation we examine dynamics in sheared polycrystal states in a binary mixture containing 10% larger particles in two dimensions. We find large stress fluctuations arising from sliding motions of the particles at the grain boundaries, which occur cooperatively to release the elastic energy stored. These dynamic processes are visualized with the aid of a sixfold angle $α_j(t)$ representing the local crystal orientation and a disorder variable $D_j(t)$ representing a deviation from the hexagonal order for particle $j$.
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