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根据位错在含沉淀相金属中的运动规律,建立了一个含沉淀相的二维离散位错动力学模型以模拟沉淀相体积分数在镍基合金中的影响。通过计算位错受到的力,包括外力、位错间的长程弹性应力、位错运动时受到的固溶摩擦力及反相畴界力等,得到位错的运动状态,然后应用Orowan公式得到相应的应力应变曲线。模型考虑了位错的增殖、湮灭以及超位错切割沉淀相的机制。模拟中,沉淀相用直径相同的圆表示,沉淀相体积分数分别为30%,40%和50%。模拟结果表明增大沉淀相体积分数可使镍基合金变形抗力增大,且随着沉淀相体积分数增高,沉淀相体积分数对合金变形抗力的影响变大。
According to the motion law of dislocations in precipitated phase metals, a two-dimensional discrete dislocation kinetics model with precipitated phases was established to simulate the influence of the volume fractions of precipitated phases in the nickel-based alloys. The dislocation motion state is obtained by calculating the force of dislocation, including external force, long-range elastic stress between dislocations, solid-solution friction and anti-phase boundary force when dislocation motion, and then using the Orowan formula to obtain the corresponding Stress-strain curve. The model considers the mechanism of dislocation growth, annihilation, and super-dislocation cleavage. In the simulation, the precipitates are represented by circles of the same diameter, and the precipitated phase volume fractions are 30%, 40% and 50%, respectively. The simulation results show that increasing the volume fraction of precipitated phase can increase the deformation resistance of the Ni-based alloy, and as the volume fraction of the precipitated phase increases, the influence of the precipitated phase volume fraction on the deformation resistance of the alloy becomes larger.