Abstract
The influence of calcium additives (from 0,1 to 1,0 wt.%) on the phase composition and the solidus temperature of ML5 magnesium alloy was studied. During the alloy crystallization in the presence of aluminum, calcium forms an intermetallic compound with a variable composition containing Al (53,4–57,4 %), Ca (42,6–42,8 %) and Mg (0,002–3,8 %). As the temperature decreases, this compound degenerates to Al 2 Ca combination. The impact of calcium on the number of Mg 17 Al 12 and Al 2 Ca phases as well as its distribution in the structure of the cast and heat-treated ML5 alloy was analyzed. By means of the electron microprobe analysis, it was found that calcium and aluminum were concentrated along the boundaries of the solid magnesium solution. It was shown that satisfactory mechanical properties of magnesium alloys containing calcium could only be acquired by their smelting and casting according to the process preventing metal contamination with rough inclusions. It was found that small calcium additions (up to 1 wt.%) increased combustion temperature and reduced the oxidation of the alloy at elevated temperatures (up to 715 °C). The effect of sulfur hexafluoride on the loss of calcium in flux-free melting was found.
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Schedule a callMore From: Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy)
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