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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions
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Mechanism of boron removal of primary Si phases and morphology evolution of impurity phases during slow cooling solidification refining of Al-30wt.%Si alloy with Zr additions

机译：硼去除原发性Si阶段的机制及杂质相的形态演化在缓慢冷却凝固精制杂质阶段的Al-30wt。Zr添加剂中的％Si合金

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This work combines the control of kinetic factors and the addition of a small amount of Zr element in Al-Si solvent refining process to obtain a super high B removal rate. Impurity removal of primary Si phases in Al-30wt.%Si alloy is evaluated by solvent refining with slow cooling rates of 0.4, 2, 10, and 50 mk . s(-1), and Zr addition contents of 0, 330,1000, and 3000 ppmw, respectively. With a 3000 ppmw Zr addition, the removal fraction of B in the primary Si is all over 93% and the best value reaches 99.36%. The P content is more sensitive to the cooling rate but does not change significantly with the increase of Zr. By morphology observation and ICP-OES analysis of the primary Si phases, the interaction between Zr, B, and Si, and the morphology evolution of ZrB2 and ZrSi2 phases are revealed. Based on theoretical calculations, the formation temperature of ZrB2 in the Al-Si melt is evaluated and a competitive reaction mechanism is discovered. Due to the excessive Zr addition, Zr first reacts with B and forms ZrB2 before the primary Si phase growth, which causes a decrease of the B content in the melt and contributes to the high B removal fraction. The remaining Zr in the melt combines with Si to form ZrSi2 phases. A model is established to describe the different trapping/ engulfing/ pushing situations of ZrB2 and ZrSi2 phases, which determine the final impurity content in the refined primary Si phases. (C) 2020 Elsevier B.V. All rights reserved.
机译：这项工作结合了动力学因素的控制和在铝硅溶剂精炼过程中添加少量锆元素，以获得超高的硼去除率。Al-30wt中初生硅相的杂质去除硅合金通过溶剂精炼进行评估，缓慢冷却速度为0.4、2、10和50 mk。s（-1）和Zr添加量分别为0、3301000和3000 ppmw。当Zr添加量为3000ppmw时，初生Si中B的去除率均在93%以上，最佳去除率达到99.36%。P含量对冷却速率更为敏感，但随Zr含量的增加变化不明显。通过对初生硅相的形貌观察和ICP-OES分析，揭示了Zr、B和Si之间的相互作用，以及ZrB2和ZrSi2相的形貌演化。在理论计算的基础上，计算了Al-Si熔体中ZrB2的形成温度，发现了竞争反应机理。由于添加过量的Zr，Zr首先与B反应，在初生Si相生长之前形成ZrB2，这导致熔体中B含量降低，并导致B去除率高。熔体中剩余的Zr与Si结合形成ZrSi2相。建立了一个模型来描述ZrB2和ZrSi2相的不同捕获/吞没/推进情况，这决定了精炼初生硅相中的最终杂质含量。（C） 2020爱思唯尔B.V.版权所有。

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