Production of aluminum-magnesium alloys with impro - ved properties during their crystallization under conditions of high centrifugal forces

The influence of centrifugal forces on the crystallization process of aluminum-magnesium alloy AMг6 (АЛ23, ASTM-518.0 (G8A)) has been studied. A physicochemical and phase analysis of the structures of AMг6 castings obtained by centrifugal casting was carried out. It is established that crystallization of this alloy under conditions of increased centrifugal forces characterized by the gravity load coefficient 300–500 allows forming the structure without formation of brittle phase β(Mg₂Al₃), which is formed at other traditional casting methods, including centrifugal casting with the load up to 250g. In addition, it was determined that increasing the load from 300g to 500g allows  reducing the granularity of the material about 2 times (to values of about 50 microns) and contributes to the purification of the melt from brittle iron-silicon compounds in the solid solution of aluminum. Thus, the share of such compounds is reduced by 10%, and in comparison with the initial charge of melting – by 20 %. The investigated load increase makes it possible to increase the degree of alloying of the crystal lattice of the aluminum phase and to obtain material with increased strength and plasticity by at least 10 and 30 %, respectively. As a result of researches the alloy AMг6 with strength 275/230 MPa and relative elongation 8.9/18.6 % at temperature of material 20/300 °С accordingly is obtained. The prospects of using the obtained aluminium-magnesium alloys with improved properties are shown.

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