Study of the influence of vibration processing of the melt on the structure and mechanical properties of the Al-Si eutectic system

In industry, it is important to improve the quality of casting aluminum alloys. By means of vibration it is possible to control the crystallization process, and thereby obtain products with a given structure and properties. The aim of this work is to expand the understanding of the patterns of formation of the structural-phase state of cast aluminum alloys depending on the parameters of frequency, amplitude and time of vibration action on the crystallizing melt. It has been determined that vibration treatment of the melt during crystallization effectively modifies the grain structure of α-Al. The use of resonant vibration treatment of the melt during the crystallization process helps to refine the size of α-Al grains, but is not effective for degassing the melt. Vibration processing of the melt during pouring with a frequency of 100 Hz and a vibration displacement of 102 pm ensures a uniform distribution of pores throughout the volume of the casting, however, the number and total area of gas bubbles is higher in comparison with castings obtained during processing with lower frequencies. It has been established that vibration before complete crystallization contributes to the formation of increased porosity in castings. It has been established that vibration processing of the melt during pouring ensures the production of castings without visible porosity, refinement of the grain structure and increase in the strength properties of the eutectic Al-12Si alloy. The authors declare no conflicts of interests.

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