| Popis: |
The paper presents the results of the study of the phase composition of hypereutectic silumin Al – 16.0 at. % Si – 0.2 at. % Fe. A comparative analysis of the phase composition of samples obtained at an average melt cooling rate of 102 K/s and at an ultra-high melt cooling rate of 105 K /s was carried out. At an average rate, the samples solidified in a graphite mold, and the ultra-high melt cooling rate was provided during the production of foils by the method of ultrafast quenching from the melt. It was established by X-ray diffraction and micro X-ray spectral analysis that the rapidly solidified foils consist of an aluminum-based solid solution supersaturated by silicon, dispersed silicon particles and the AlFeSi2 ternary compound phase. Comparative analysis of the results of X-ray diffraction and X-ray spectral studies of samples obtained at different melt cooling rates indicate that, during rapid solidification, the aluminum-based supersaturated solid solution contains up to 2 at. % Si. |
