利用宏观－微观耦合的模型和热焓法处理结晶潜热,用外节点直接差分法数值计算技术,模拟了AL－2WT％CU合金凝固过程的冷却曲线和晶粒组织特征,并与实验结果进行了比较.结果表明:冷却速率越大的凝固区域,再辉出现得越早,平台凝固段越短.模拟所得冷却曲线和晶粒组织特征同实测值吻合较好.“,”It is well known that macroscopic models were often used to simulate the cooling curves in solidification. However, they could not predict the characteristics of grain structure because the microscopic mechanisms involved in the solidification process were not taken into account. We used a macro microscopic model to investigate the cooling curves and grain structure in solidification. At the macroscopic level, the heat diffusion equation was solved with an enthalpy formulation using a DFDM(direct finite d...