Research of the Influence on the Modification of Beryllium in Al–Si Alloy

Iryna Hren$^{1}$, Štefan Michna$^{1}$, Liudmyla Drozdyk$^{2}$, Jaromír Cais$^{1}$, Lenka Michnová$^{1}$, Jaroslava Svobodova$^{1}$, Lubomír Hodinář$^{1}$

$^{1}$Jan Evangelista Purkyně University in Ústí nad Labem, Faculty of Production Technologies and Management, 1 Pasteurova Str., 40096 Ústí nad Labem, Czech Republic
$^{2}$Yuriy Fedkovych Chernivtsi National University, 2 Kotsyubynsky Str., UA-58012 Chernivtsi, Ukraine

Received: 21.01.2018; final version - 19.09.2018. Download: PDF

Modification of molten metal is performed for the eutectic and subeutectic silumins prior to its casting by using strontium, which has a time-limited effect up to 1–1.5 hours. Beryllium is used in order to prolong the modifying effect. The aim of the experiment is to examine both the distribution and the effect of beryllium in the structure on the temporary extension of the modification in the Al–Si alloys in combination with strontium modifier. Beryllium is used as a master AlBe$_5$ alloy, and samples are cast by gravity casting in a preheated metal moulding. Chemical analysis is performed by means of spectral analysis. Specimens are evaluated by using a confocal microscope. The elements’ distribution in the AlSi$_7$Mg$_{0.3}$ alloy microstructure, with emphasis on the distribution of Sr and Be as the individual structural components, is investigated using a scanning electron microscope with EDS analyser.

Key words: AlSi$_7$Mg$_{0.3}$ alloy, modifier, beryllium, strontium, electron microscopy, EDS analysis.



PACS: 61.72.Ff, 64.75.Op, 66.30.Lw, 81.05.Bx, 81.30.Fb, 81.40.Ef, 82.80.Pv

Citation: Iryna Hren, Štefan Michna, Liudmyla Drozdyk, Jaromír Cais, Lenka Michnová, Jaroslava Svobodova, and Lubomír Hodinář, Research of the Influence on the Modification of Beryllium in Al–Si Alloy, Metallofiz. Noveishie Tekhnol., 40, No. 12: 1637—1647 (2018)

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