| Al-4%Cu合金定向凝固温度梯度变化及界面形态演化规律 |
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| 引用本文： | 唐峰涛,屈敏,刘林,傅恒志.Al-4%Cu合金定向凝固温度梯度变化及界面形态演化规律[J].铸造技术,2007,28(5):646-648,652. |
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| 作者姓名： | 唐峰涛 屈敏 刘林 傅恒志 |
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| 作者单位： | 西北工业大学凝固技术国家重点实验室,陕西,西安,710072 |
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| 摘 要： | 摘 要：研究了Al-4%Cu合金定向凝固界面形态随抽拉速率的演化规律及其转变机制.通过测量自行研制的定向凝固设备的温度梯度,发现温度梯度随抽拉速率的增大而减小,并随炉体温度的升高而增大.研究了Al-4%Cu合金定向凝固的界面演化及生长形态,对比后发现,在胞状生长过程中,竞争淘汰是主要的生长方式;而在高速抽拉过程中,尖端开裂是枝晶的主要生长方式.
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| 关 键 词： | 界面形态演化 定向凝固 Al-4％Cu合金 尖端开裂 |
| 文章编号： | 1000-8365（2007）05-0646-03 |
| 修稿时间： | 2006-10-282007-03-05 |
Temperature Gradient Variation and Interface Morphology Evolution of Al-4%Cu Alloy in Directional Solidification Process |
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| TANG Feng-tao,QU Min,LIU Lin,FU Heng-zhi.Temperature Gradient Variation and Interface Morphology Evolution of Al-4%Cu Alloy in Directional Solidification Process[J].Foundry Technology,2007,28(5):646-648,652. |
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| Authors: | TANG Feng-tao QU Min LIU Lin FU Heng-zhi |
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| Abstract: | The interface morphological evolution of AI-4% Cu alloy is studied with different pulling rates in directional solidification process, and the transformation mechanism is investigated as well. The temperature gradient is measured in the self-made directional solidification apparatus, and it is found that the temperature gradient decreases with increasing withdrawal velocity and increases with increase of furnace temperature. The interface morphological evolution and growth morphology in directional solidification of AI-4% Cu alloy is studied. The comparison analysis shows that the competitive selection is the dominated mode in the process of the cellular growth; but the tip split is the prior mode. in the process of high withdrawal velocity. |
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| Keywords: | Interface morphology evolution Directional solidification AI-4 % Cu Alloy Tip split |
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