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基于相图计算方法,耦合微观凝固模型,计算了Al-Cu-Si合金的凝固路径,研究了不同枝晶形貌假设条件下合金凝固路径的区别,并获得了温度与固相体积分数变化的定量关系。计算结果表明:Al-4.61Cu-0.92Si合金在Lever模型条件下的凝固路径为:L→(L+α),而在球形、圆柱、等轴晶、内圆柱、平板、内球等枝晶形貌假设下的凝固路径为:L→(L+α)→(L+α+θ)→(L+α+θ+Si)。枝晶形貌假设对合金凝固路径计算结果的影响较大,球状与圆柱状枝晶形貌假设条件下的计算结果与Lever模型比较接近,而平板、内球与内圆柱枝晶形貌假设条件下的计算结果更加接近Scheil模型。
Based on the phase diagram calculation method and coupling microscopic solidification model, the solidification path of Al-Cu-Si alloy was calculated, and the difference of solidification path of Al-Cu-Si alloy under different hypotheses of dendritic morphology was studied, and the change of temperature and volume fraction of solid phase Quantitative Relationship. The results show that the solidification path of Al-4.61Cu-0.92Si alloy under the Lever model is: L → (L + α), while in spherical, cylindrical, equiaxed, The solidification path under the morphological assumption is: L → (L + α) → (L + α + θ) → (L + α + θ + Si). The dendritic morphology hypothesis has a great influence on the calculation results of the alloy solidification path. The calculation results of spherical and cylindrical dendritic morphology are close to those of the Lever model, while the flat plate, inner sphere and inner cylinder dendrite morphology assumptions The result of the calculation is closer to the Scheil model.