取向硅钢中AlN析出的动力学

利用理论计算方法系统地计算和分析了取向硅钢中AlN在不同的形核机制下的析出动力学特征,如临界形核半径、临界形核功、相对形核率以及时间-温度-析出(TTP)曲线。计算结果显示,AlN在均匀形核、晶界形核或位错形核时临界形核尺寸不变。晶界形核时,AlN的临界形核功最小,相对形核率最大,AlN沉淀析出TTP曲线鼻子点温度为1 020℃,AlN沉淀析出的形核机制主要为晶界形核。

Kinetics of Precipitation for AlN in Grain-Oriented Silicon Steel

The characteristics of precipitation kinetics of AlN in grain-oriented silicon steel with different nucleation mechanisms, such as critical nucleation radius, critical nucleation energy, nucleation rate and TTP curve, was calculated and analysed by theoretical calculation method. The results show that the critical nucleation radii of homogeneous nucleation mechanism, boundary nucleation mechanism and dislocation nucleation mechanism have nearly equal size. With boundary nucleation mechanism, the nucleation rate of AlN is the biggest and the nucleation energy of AlN is the lowest. The nose point temperature of the TTP curve of AlN with boundary nucleation mechanism is 1020??, and the dominant nucleation mechanism of AlN in grain-oriented silicon steel is boundary nucleation mechanism.