| Al－Ti－C中间合金中TiC粒子的失效问题 |
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| 引用本文： | 冯庆玲,王昶明.Al－Ti－C中间合金中TiC粒子的失效问题[J].清华大学学报(自然科学版),1994(5). |
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| 作者姓名： | 冯庆玲 王昶明 |
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| 作者单位： | 清华大学材料科学与工程系,北京轻工业学院机械工程系 |
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| 摘 要： | 研究了铝及铝合金的新型晶粒细化剂Ａｌ－Ｔｉ－Ｃ中间合金中ＴｉＣ粒子的失效问题。当熔液在正常熔炼温度下,即低于１２７３Ｋ保温时,所得的合金失去了晶粒细化效果。实验发现,失效的中间合金在高于１５２３Ｋ温度下重熔,ＴｉＣ核心可以再激活。透射电镜衍射分析表明,Ａｌ－Ｔｉ－Ｃ中间合金失效的原因是ＴｉＣ粒子周围出现了Ａｌ４Ｃ３及Ｔｉ３ＡｌＣ。其中Ａｌ４Ｃ３可能对ＴｉＣ粒子的失效起决定作用。对再激活的核心粒子的研究表明,它们主要由ＴｉＣ粒子构成。
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| 关 键 词： | 铝 晶粒细化 TiC 细化剂 |
The "poisoning" effect of TiC particles in Al-Ti-C master alloy |
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| Feng Qingling.The "poisoning" effect of TiC particles in Al-Ti-C master alloy[J].Journal of Tsinghua University(Science and Technology),1994(5). |
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| Authors: | Feng Qingling |
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| Abstract: | The present investigation has been made to study the " poisoning" effect of TiC particles in new developed Al-Ti-C master alloy as a grain refiner for aluminium and its alloys. As the melt was held at the normal melting temperature of below 1273 K,the resultant master alloy lost its grain refining efficiency. It has been found that a suPer heating treatment of the melt at higher temperatures (>1 523 K) rejuvenated the nucleate particles again. Electron diffraction of poisoned titanium carbide particles showed the presence of considerable amounts of Al4C3 and Ti3AlC, of which Al4C3should be responsible for the poisoning effect. The structural analysis of the rejuvenated carbide particles confirms that they are essentially constituted of uncontaminated TiC. |
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| Keywords: | aluminiuml grain refinement TiC grain refiner |
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