| Al-Ti-B中间合金中第二相沉淀现象研究 |
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| 引用本文： | 陈亚军,许庆彦,黄天佑.Al-Ti-B中间合金中第二相沉淀现象研究[J].北京科技大学学报,2007,29(5):465-469. |
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| 作者姓名： | 陈亚军 许庆彦 黄天佑 |
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| 作者单位： | 清华大学机械工程系,北京,100084 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 采用氟盐铝热反应法制取Al-Ti-B中间合金细化剂,对其反应过程进行了分析.通过对比挤压前后的微观组织,研究挤压变形对组织造成的影响.结果表明,挤压使得TiAl3颗粒尺寸减小、表面趋于平滑,挤压过程中发生的再结晶现象使TiB2分布均匀弥散.另外通过静置实验研究了α-Al基体中第二相的沉淀现象,深入分析了沉淀过程及原因,提出了减少第二相颗粒聚集、沉淀的方法,着重强调了优化挤压工艺和添加适量稀土元素的作用.
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| 关 键 词： | 中间合金 细化剂 微观组织 再结晶 第二相 中间合金 第二相沉淀 现象研究 refiner master alloy second phases precipitation 作用 稀土元素 添加 挤压工艺 优化 方法 颗粒聚集 沉淀过程 沉淀现象 基体 实验 静置 分布均匀 |
| 修稿时间： | 2006-01-302006-03-02 |
Research on precipitation of second phases for Al-Ti-B master alloy refiner |
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| CHEN Yajun,XU Qingyan,HUANG Tianyou.Research on precipitation of second phases for Al-Ti-B master alloy refiner[J].Journal of University of Science and Technology Beijing,2007,29(5):465-469. |
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| Authors: | CHEN Yajun XU Qingyan HUANG Tianyou |
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| Institution: | Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | An Al-Ti-B master alloy was prepared by the reaction of complex halide salts with molten aluminum at high temperature and the thermodynamics principle was analyzed. The effect of extrusion process on microstructure was studied by comparing the microstructure after squeezing with the as-cast microstructure. It is found that TiAl3 blocks become smaller and smoother after extrusion, and recrystallization happens when squeezing, which results in homogeneous distribution of TiB2 particles. Besides, the precipitation of TiAl3 and TiB2 in aluminum melt was investigated by stewing experiment and the factors affecting deposition were described. The methods to slow or impede precipitation of second-phase particles were put forward, and the optimized extrusion process and the addition of proper rare earth were emphasized. |
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| Keywords: | master alloy grain refiner microstructure recrystallization second-phase particles |
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