Structure and refinement performance of Al-5Ti-0.2C master alloy produced via an improved self propagating synthesis approach
Structure and refinement performance of Al-5Ti-0.2C master alloy produced via an improved self propagating synthesis approach
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DOI：
10.1007/s12540-017-6586-z
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发表时间：
2017-07
影响因子：
3.5
通讯作者：
K. Svynarenko;Yubo Zhang;J. Jie;V. Kutsova;Tingju Li
中科院分区：
文献类型：
--
作者：
K. Svynarenko;Yubo Zhang;J. Jie;V. Kutsova;Tingju Li
传统的自蔓延高温合成(SHS)法生产Al-Ti-C中间合金时，生产温度降低到1523K以下，细化效果急剧恶化。在本工作中，提出了一种简单而有效的方法来改善低含TiC精炼机的燃烧过程。首先进行SHS反应得到Al-10TiC浆料，然后与Al-Ti熔体混合得到Al-5Ti-0.2C中间合金。结果表明，改进的SHS法制备TiC，反应开始后Al的温度比常规制备方法提高了90~100K，为TiC的形成提供了更好的动力学条件。结果表明，在1323K的生产温度下，碳化物的平均尺寸比常规生产的细化剂提高了100%，这是中间合金细化性能提高的原因之一。
When Al-Ti-C master alloys are produced via the conventional Self-propagating High-temperature Synthesis (SHS), the reduction of production temperature below 1523 K leads to the drastic deterioration of the refiner efficacy. In the present work, a simple yet effective way to improve the combustion process for low TiC-containing refiners is proposed. The SHS reaction was performed to obtain Al-10TiC slurry first, which subsequently was mixed with Al-Ti melt to obtain Al-5Ti-0.2C master alloy. By means of the proposed method, the process temperature was lowered to 1323 K. According to the results, in the case of improved SHS approach, the Al temperature after the onset of reaction increases by 90-100 K more than in the case of conventional preparation route, providing better kinetic conditions for TiC formation. As a result, at 1323 K production temperature, the average carbide size increases by 100% as compared to the conventionally produced refiner, which is claimed to be a reason for the improved refining performance of master alloy.