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采用三维晶体相场法模拟位错的预熔及熔解,研究位错发生预熔和熔解的微观组织形貌,通过时间平均原子数密度变化曲线确定位错熔解半径。研究表明,位错可以在温度低于熔点时发生预熔,但熔解速度和规模都很小;当温度达到熔点附近时,位错熔解的规模和速度都变得很大。单一位错会从其核心径向圆形向外熔解,位错熔解半径平方的倒数与温度成线性关系。
The three-dimensional crystal phase field method was used to simulate the pre-melting and melting of dislocations. The pre-melting and melting microstructure of the dislocations were studied. The dislocation melting radius was determined by the time-averaged atomic density curve. The results show that the dislocations can be pre-melted at a temperature lower than the melting point, but the melting rate and size are very small. When the temperature reaches near the melting point, the size and speed of dislocation melting become large. A single dislocation melts outwardly from its core radial circle, and the reciprocal of the square of the dislocation melting radius is linearly proportional to temperature.