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采用金属-气体共晶定向凝固工艺(GASAR工艺),制备气孔定向排列的多孔铜锰合金,并研究气孔结构的变化。结果表明:这种变化主要取决于合金的凝固模式(平面凝固、柱状胞晶凝固、柱状枝晶凝固、等轴枝晶凝固),而合金凝固模式由合金的凝固过程决定。通过数值模拟发现,随着合金凝固的进行,合金的凝固模式从胞晶凝固向柱状枝晶凝固过渡,最终变为等轴枝晶凝固。通过升高合金熔体温度和铸型的预热温度,可以缩小等轴枝晶凝固的范围,扩大定向生长气孔的区域。
The metal-gas eutectic directional solidification process (GASAR process) was used to prepare the porous copper-manganese alloy with a stomatal orientation and to study the change of stomatal structure. The results show that this change mainly depends on the solidification mode (plane solidification, columnar cell solidification, columnar dendritic solidification and equiaxed dendritic solidification). The solidification mode of the alloy is determined by the solidification process of the alloy. Through numerical simulation, it is found that with the solidification of the alloy, the solidification mode of the alloy transforms from the cell solidification to the columnar dendrite solidification and finally to the equiaxed dendrite solidification. By raising the alloy melt temperature and the preheating temperature of the mold, the range of equiaxed dendrite solidification can be narrowed, and the area of directional growth pores can be enlarged.