Al-Si合金快速等軸凝固界面響應函數及組織選擇

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基金項目:

國家重點基礎研究發展計劃資助項目(No.2007CB613903)

Interface response function and microstructure selection for AI-Si alloys during rapid equiaxed solidification

1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;
2. Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China;
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

摘要: 在快速枝晶及共晶生長理論模型基礎上,使用最高界面生長溫度判據,建立了共晶合金快速等軸凝固界面響應函數(IRF)模型,分析了Al-Si合金系各種相及組織的競爭生長,繪制了非平衡組織選擇圖.計算結果與實驗結果基本吻合,說明所建立的界面響應函數模型可以較好地預測Al-Si合金等軸凝固過程中的非平衡組織選擇及形態演化.
- 共晶合金 /
- 快速凝固 /
- 競爭生長 /
- 組織選擇
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.
- eutectic alloys /
- rapid solidification /
- competitive growth /
- microstructure selection