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在原有的晶体相场模型的自由能密度函数基础上,引入外力场与体系原子密度场耦合作用项,能够对样品施加剪切应变作用,实现位错的滑移运动。研究不同温度情况下的位错滑移特性。研究发现,位错的启动,存在一个临界温度,当温度高于临界温度时,外加一定的应变率才能启动位错运动。较低的体系温度有利于刃型位错的滑移。随着体系温度升高,刃型位错水平滑移速度变慢,而垂直方向的攀移运动明显增加。在高温情况下攀移已成为位错运动的主要形式。
Based on the free energy density function of the original crystal phase field model, the coupling action of external force field and system atomic density field is introduced to exert the shear strain on the sample to realize the sliding movement of dislocation. Dislocation slip characteristics under different temperatures are studied. It is found that there is a critical temperature at which the dislocation starts, and when the temperature is higher than the critical temperature, a certain strain rate can initiate the dislocation movement. Lower system temperatures favor the sliding of edge dislocations. As the temperature of the system increases, the blade-type dislocations move slower horizontally and climb vertically in the vertical direction. Climbing has become a major form of dislocation movement at high temperatures.