Вплив зовнішнього магнітного поля на структуроутворення алюмінієвого сплаву системи Al–Si з підвищеним вмістом заліза: Processy litʹâ, 2020, Tom 140, №2, p.22-29

• Date: 2020
• Main Authors: Наріжна, Т. М., Доній, О. М., Ворон*, М. М.
• Format: Article
• Language: Ukrainian
• Published: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2020
• Subjects: алюмінієвий сплав; доевтектичний силумін; магнітне поле; феромагнітні включення; макроструктура; мікроструктура; рентгеноструктурний фазовий аналіз; мікротвердість
• Online Access: https://plit-periodical.org.ua/index.php/plit/article/view/98
• Journal Title: Casting Processes

Received 26.05.2020 UDC 669.715:669.179 The comparative studies of the final structure of aluminum hypo-eutectic AlSi7Cu2 alloy with high iron content in the initial cast state and after the action of an external constant magnetic field on the melt after the crystallization process were studied. Macroscopic studies had shown that after the crystallization of alloy without the imposition of an external constant magnetic field in the  structure of the alloy gas pores were formed as a consequence of significant gas content of the alloy or penetration into the alloy of gases which were released from the mold. With the help of metallographic analysis star-shaped phases evenly distributed in the volume of crystallized alloy were detected in the microstructure of alloy, which was exposed to a magnetic field and a uniform distribution of α - solid solution and α + Si eutectic compared to alloy in the initial state is observed. By the method of x-ray phase analysis, it was found that this physical treatment promotes the formation of Al15(MnFe)3Si2 phase instead of Al5FeSi phase in the ingot, obtained without treatment. According to the results of Vickers microhardness measurement, it was found that the  application of an external constant magnetic field to the melt of hypo-eutectic alloy AlSi7Cu2 with high iron content allows to obtain high microhardness of solid solution in comparison with untreated alloy. Based on the results of qualitative and quantitative  metallographic studies and X-ray structural phase analysis, conclusions were drawn about the nature of the influence of external physical treatment on the structure of the investigated alloy after crystallization.