铝硅合金

After the modification with RE at temperature around 800 C, we have got granular and stubby eutectic silicon.

RE在800℃左右对含硅量为20％的铝硅合金进行变质处理，可获得颗粒状或短杆状的共晶硅。

The results of the correlations of composition, function and performances will lay a solid foundation for the fabrication of new model hypereutectic Al-Si alloy, provide evidences for theory and show the direction for industry development.

揭示了过共晶铝硅合金(Si≥20％)的成分、组织和性能之间的内在关系，为研制新型的过共晶铝硅合金提供理论依据和工业应用方向。

In order to analyze the effect of structure of hypereutectic Al-Si alloy on its machinability, the cutting test to two hypereutectic Al-Si alloys which have the same chemical composition but different structures is made and their cutting mechanism is studied.

为分析过共晶铝硅合金组织对其切削加工性能的影响，对两种化学成分相同但是组织结构不同的过共晶铝硅合金进行了切削试验研究并探讨了其切削机理。

The experiments results show that, for Al-20%Si alloy with working temperature about 820癈, the coarse primary silicon turns to be obtuse, and that the average diameter of the primary silicon decreased from 150 m to 40 m, resulting in ideal primary silicon.

研究结果表明：P在820℃左右对含硅量为20％的铝硅合金进行变质处理，粗大的初晶硅棱角钝化，平均直径从150μm下降到40μm左右，获得理想的初晶硅组织。

Dalian University of Technology,Dalian 116024, China）Abstract: To accurately analyze the eliminative effect of high frequency electromagnetic field on the nonmetallic inclusions in liquid metal, the electromagnetic eliminating experiments were made with 100, 50 and 10 μm primary Si produced by Al-Si alloys with Si content of 18%, 12.6% and 10% respectively, and was used to simulate the nonmetallic inclusions.

摘 要：为了更准确地分析高频交变电磁场对金属熔体中的非金属夹杂物的去除效果，分别利用硅含量为18%、 12.6%和10% 3种铝硅合金所生成的尺寸为100、 50和10 μm的硅块来模拟非金属夹杂物以进行电磁净化实验研究。

The current theory and application of Al-Si alloy mainly focus on the study of hypoeutectic and eutectic, therefore we systematically analyzed the modification process of hypereutectic Al-Si alloy based on the methods and results of predecessors. Several factors including the modification temperature, the content of modifier, the available holding time, the times of repeat melting , the casting temperature and the speed for cooling have been studied in order to understand its effects to the composition, function and performances of primary silicon and eutectic silicon.

中文摘要本文针对目前Al-Si合金相关应用和理论的研究多集中于亚共晶和共晶合金的情况，在前人的研究成果和研究方法的基础上，对过共晶Al-Si合金变质处理进行了较为系统的分析，研究了变质剂的成分配比、变质温度、变质剂的加入量、变质后的静置时间、浇注温度及冷却速度等因素对过共晶铝硅合金中初晶硅和共晶硅的大小、形状、数量和分布的影响。

The current theory and application of Al-Si alloy mainly focus on the study of hypoeutectic and eutectic, therefore we systematically analyzed the modification process of hypereutectic Al-Si alloy based on the methods and results of predecessors. Several factors including the modification temperature, the content of modifier, the available holding time, the times of repeat melting , the casting temperature and the speed for cooling have been studied in order to understand its effects to the composition, function and performances of primary silicon and eutectic silicon.

本文针对目前Al-Si合金相关应用和理论的研究多集中于亚共晶和共晶合金的情况，在前人的研究成果和研究方法的基础上，对过共晶Al-Si合金变质处理进行了较为系统的分析，研究了变质剂的成分配比、变质温度、变质剂的加入量、变质后的静置时间、浇注温度及冷却速度等因素对过共晶铝硅合金中初晶硅和共晶硅的大小、形状、数量和分布的影响。

The result shows that modification can make the β-Si phase thin when the joining amount is 0.3wt%, making the best modification result. Alloying elements Mn and Ni are always used to neutralize iron"s harm in aluminum alloys. They can form many kinds of complicated metallically compounds with Fe and Al, and eliminate needle-like iron-rich phases to reduce iron"s harm in Al-Fe alloy. Copper makes the alloy microstructure thick and electromagnetic stirring obviously makes the alloy microstructure thin, round the second phase, when the stirring voltage is 200V, making the best result; Reheat makes liquid phases emerge in the alloy, when the warming temperature is 650?

研究结果表明：红磷可以明显细化合金中的初晶硅，当加入量为0.3wt%时，取得最佳变质效果；锰、镍合金中加入后，通过形成多种复杂金属间化合物，细化针片状富铁相，减小铁对铝硅合金性能的危害；铜使合金微观组织发生粗化；电磁搅拌明显细化合金组织，使第二相圆整化，搅拌电压为200V时，取得最佳细化效果；二次加热使合金组织中产生部分液相，在650？

It was found that casting Al-Si alloy conforming to industrial standard could be obtained after refining by using cryolite and sodium chloride as purificant and removing iron by using manganese as de-ironing medicine.

研究结果得出，使用含冰晶石和氯化钠混合物的精炼剂以及金属锰为除铁剂并采取适当的工艺方法，可以有效地去除一次铝硅合金中的杂质，制取符合工业标准的铸造铝硅合金。

Different from the perieutectic reaction Liq+δ→β, perieutectic reaction in Al-Si alloys containing Mn acts as Liq+δ→α.

与铝硅铁三元系中的包晶反应Liq+δ→β不同，加锰铝硅合金中δ铁相的包晶反应则以Liq+δ→α的形式进行。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。