为克服相场法在数值模拟中计算能力低的缺点,将四叉树技术应用于相场法数值模拟的网格系统中,构建了基于四叉树的自适应网格数值模拟方法。采用该方法对铝合金进行了二维等温凝固过程组织模拟,模拟结果与理论和试验金相分析符合。同时,通过与均匀网格的对比,说明了在保证同等计算精度的前提下,采用四叉树自适应网格方法,在凝固时间为7.5×10-5s时,网格数整体减少为均匀网格的1.74%。该数据表明基于四叉树的方法极大地提高了相场法数值模拟的计算能力。 In order to overcome the shortcomings of low computational ability of phase-field method in numerical simulation, quadtree technique was applied to the grid system of numerical simulation of phase field method, and an adaptive grid numerical simulation method based on quadtree was constructed. This method was used to simulate the two-dimensional isothermal solidification process of aluminum alloy. The simulation results are consistent with the theoretical and experimental metallographic analysis. At the same time, compared with the uniform grid, the quadtree adaptive grid method is proved on the premise of ensuring the same calculation precision. When the solidification time is 7.5 × 10-5s, the grid number reduces to a uniform grid Lattice 1.74%. This data shows that quadtree-based methods greatly improve the computational power of numerical modeling of phase-field methods.