MAGNESIUM-CONTAINING HIGH-SILICA ALUMINIUM ALLOYS USED AS STRUCTURAL MATERIALS AND METHOD OF THEIR MANUFACTURING Russian patent published in 2012 - IPC C22C21/02 C22C21/08 

FIELD: metallurgy.

SUBSTANCE: magnesium-containing high-silica aluminium alloys intended for use as structural materials, including shapes, bars, sheets and forged pieces, are manufactured with the help of a technological process containing the following operations: ingot casting from the alloy by method of casting into a chill mould, preliminary heating of the ingot in order to disperse particles of eutectic phase of silicon, treatment in thermoplastic condition and thermal treatment in order to produce an item of final shape and with modified microstructure. Aluminium alloys contain, wt %: 0.2-2 of magnesium and 8-18 of silicon and have homogeneous and fine-grained microstructure, at the same time the aluminium matrix is homaxonic with the average size of grain, not exceeding 6 mcm, and particles of silicon and secondary phase are dispersed at the average size of particles not exceeding 5 mcm. Without addition of any modifiers they are produced with low costs by combination of casting into a chill mould with treatment in thermoplastic condition and thermal treatment.

EFFECT: high plasticity and relatively high strength.

8 cl, 13 dwg, 10 tbl, 1 ex