Al-Si合金快速等轴凝固界面响应函数及组织选择
Interface response function and microstructure selection for AI-Si alloys during rapid equiaxed solidification
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摘要: 在快速枝晶及共晶生长理论模型基础上,使用最高界面生长温度判据,建立了共晶合金快速等轴凝固界面响应函数(IRF)模型,分析了Al-Si合金系各种相及组织的竞争生长,绘制了非平衡组织选择图.计算结果与实验结果基本吻合,说明所建立的界面响应函数模型可以较好地预测Al-Si合金等轴凝固过程中的非平衡组织选择及形态演化.Abstract: On the basis of the rapid growth model for dendrite and eutectic and the criterion of the highest temperature for interface growth, an interface response function (IRF) of eutectic alloys during rapid equiaxed solidification was established. With the IRF, competitive growth between the primary and eutectic phases of Al-Si alloys was investigated and a microstructure selection map of Al-Si alloys during non-equilibrium solidification was constructed. The calculation results show a good agreement with those of atomization experiments, indicating that the IRF model can be used to predict satisfactorily the microstructure selection and evolution of Al-Si alloys.