论文部分内容阅读
采用耦合溶质场和流场的相场模型,模拟了半固态金属材料(Al-2.0mol%Si合金)成形过程中微观组织的演变,分析和讨论了扰动强度对微观组织演变的影响。结果表明:随着浓度扰动的增加,二次枝晶臂越来越发达,枝晶形貌由树枝状逐渐变成蔷薇状,并向近似的球状组织发展;在扰动强度达到0.4时,枝晶基本上趋于球形生长,枝晶生长前沿溶质扩散层的厚度也趋于一致。模拟结果与半固态组织的成形机理基本一致。
The evolution of microstructure during the forming process of semi-solid metal (Al-2.0mol% Si alloy) was simulated by the coupled field model of solute field and flow field. The influence of disturbance intensity on microstructure evolution was analyzed and discussed. The results showed that the secondary dendrite arm became more and more developed as the concentration perturbation increased, and the dendritic morphology gradually changed from dendritic to rose-like and developed into an approximate spherical structure. When the disturbance intensity reached 0.4, the dendrite Basically tends to spherical growth, dendrite growth frontal solute diffusion layer thickness also tends to be consistent. The simulation results are basically consistent with the forming mechanism of semi-solid structure.