Nanoobjects microscopy

Magnetohydrodynamic treatment and optimization of alloying complex of Al-Si-Mg casting alloys
Monastyrska T.O.1, Berezina A.L.1, Molebnyi O.A.1, Fikssen V.M.2
1 G.V. Kurdyumov Institute for Metal Physics of the NAS of Ukraine, Vernadsky Blvd. 36, Kyiv-142, 03680, Ukraine 
E-mail: monast@imp.kiev.ua
2 Physico-Technical Institute of Metals and Alloys of the NAS of Ukraine, Vernadsky Blvd. 34/1, Kyiv-142, 03680, Ukraine

The possibility of improving the structure and properties of aluminum cast alloy based on Al-Si-Mg due to the melt treatment in the magnetohydrodynamic installation [1, 2] has been studied in this work. Also, the optimization of the chemical composition and select the optimal modes of heat treatment of the alloys to improve the structure and complex of properties was carried out. It was shown that the most effective alloying element which improve the strength characteristics of Al-Si-Mg alloy is lithium. It was found that the introduction of lithium into the alloy in the amount of 0.2% leads to the modification of the Al-Si eutectic and provides the increase in the yield strength and tensile strength by 15%, while the ductility increases more than three times as much as compared to that of the base alloy.

1.	Polishchuk V., Horn R., Tsin M., Dubodelov V., Pogorsky V., Trefniak V. Magnetodynamic pumps for liquid metals // Kyiv, Naukova dumka. -1989. - P. 256. (in Russian).
2.	Fixsen W., Ohm L., Trefnjak V. Electro-magnetic low-pressure casting of Al alloys // Casting Plant &Technology International. -2007. - N 2. - Р. 38-39.