论文标题
压力渗透和脱位动力学的尺寸影响：Fe-Ni-Cr钢
Size effects in stress penetration and dynamics of dislocations: Fe-Ni-Cr steel
论文作者
论文摘要
FCC钢310S中边缘（线）位错的运动表明取决于基于使用分子动力学（MD）建模的纳米级结构的大小。效果归因于压力传播到中内部的时间（和大小）依赖性。该观察结果对于解释对压力效应的任何MD研究至关重要，因为这些研究受时间依赖性的内部病毒应力的控制。尤其是，位错的速度与病毒应力的局部内部剪切成分$ s_ {xy} $的局部剪切成分的值良好，而不是外部剪切压。在阻尼的谐波振荡器的模型中很好地描述了压力穿透的动力学，其中特征振荡频率取决于沿波传播的方向晶体学层的数量，而应力传播的速度是声音的速度。脱位运动所需的最小应力（PEIERLS应力）确定为0.75 GPA。压力和温度对位错运动的影响是系统地研究的。
Movement of edge (line) dislocations in FCC steel 310S is shown to depend on the size on nanoscale structures, based on modeling withing molecular dynamics (MD). The effect is attributed to time (and size) dependencies of pressure propagation into the medium interior. The observation is crucial in interpreting any MD studies of pressure effects since these are governed by time-dependent internal virial stresses. In particular velocity of dislocations scales well with value of local internal shear component of virial stress $S_{xy}$ and not with external shear pressure. Dynamics of stress penetration is described well within the model of damped harmonic oscillator, where characteristic oscillation frequency depends on number of crystallographic layers in direction along the wave propagation while the speed of stress propagation is the speed of sound. The minimal stress required for dislocation movement (Peierls stress) is determined to be 0.75 GPa. Pressure and temperature effects on dislocation movement are systematically investigated.
