摘要
Thermosolutal convection has a remarkable effect on solidified microstructure. The microstructures of directionally solidified Al-38.5%Cu hypereutectic alloy were investigated by using the apparatus with a high temperature gradient. The results show that the solute composition ahead of the solid/liquid interface (copper element) decreases along the solidification direction due to the thermosolutal convection in the melt. The theoretical calculation results indicate that the primary θ-Al2Cu phase of faceted dendrites disappears when the alloy composition decreases to 37%Cu for a pulling velocity of 5 μm/s, in agreement with the experimental results. The microstructure of directionally solidification is eutectic structure of entirely coupled growth without any faceted dendrites of primary θ-Al2Cu when the solid fraction reaches 0.49 and the alloy composition is less than 37%Cu.
源语言 | 英语 |
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页(从-至) | 617-620 |
页数 | 4 |
期刊 | Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering |
卷 | 36 |
期 | 4 |
出版状态 | 已出版 - 4月 2007 |