Comparison of Si Refinement Efficiency of Electromagnetic Stirring and Ultrasonic Treatment for a Hypereutectic Al-Si Alloy
Comparison of Si Refinement Efficiency of Electromagnetic Stirring and Ultrasonic Treatment for a Hypereutectic Al-Si Alloy
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DOI：
10.1007/s11665-017-2602-1
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发表时间：
2017-04-01
影响因子：
2.3
通讯作者：
Zoqui, Eugenio Jose
中科院分区：
文献类型：
--
作者：
Haghayeghi, Reza;de Paula, Leandro Cassio;Zoqui, Eugenio Jose
研究了电磁搅拌、超声处理及其组合对过共晶Al-Si合金（A390）中Si颗粒细化的影响。所有这三种物理方法都产生了颗粒形状和尺寸的相当大的变化，其中UT产生最细的尺寸。通过空化气泡的爆炸在Si颗粒内部产生孔被确定为在初级Si破碎之前发生。此外，透射电子显微镜分析显示，通过在液体中施加外部场，在初级Si颗粒上形成孪晶。熔体的UT足以产生平均尺寸类似于12 μ m的细小初生Si颗粒。初晶Si颗粒细化和共晶Si变质提高了合金的力学性能。
The effects of electromagnetic stirring, ultrasonic treatment (UT), and their combination on the Si particles refinement in a hypereutectic Al-Si alloy (A390) were examined. All three physical methods yielded a considerable change in the shape and size of the particles, with UT producing the finest size. The creation of holes inside the Si particles via the explosion of cavitation bubbles was determined to occur before fragmentation of primary Si. In addition, transmission electron microscopy analysis revealed twin formation on primary Si particles by application of an external field in the liquid. UT of the melt was sufficient to produce fine primary Si particles with average size of similar to 12 A mu m. The primary Si particles refinement and eutectic Si modification improved the mechanical properties.