compared with the deformed aluminum alloy, the cast aluminum alloy has many advantages, such as low price, tissue isotropy, special tissue, easy to produce complex parts, small batch production and mass production. It has important theoretical significance and great practical application value to develop high strength and tough cast aluminum alloy materials which can replace partial deformation aluminum alloy and its casting process, which can achieve the purpose of casting and forging, shortening manufacturing cycle and reducing manufacturing cost.
    high strength cast aluminum alloy is also one of the main processes of Hangzhou Hongcheng Pml Precision Mechanism Ltd. To obtain high strength and toughness cast aluminum alloy material, it is necessary to purify and purify it. Purification and purification are to reduce the content of gas in aluminum alloy, reduce inclusions and control the content of impurity elements. The adverse effects of gases, inclusions and impurity elements are: generating some undesirable phases, such as brittle phase and low melting point, on the grain boundary, reducing the grain boundary strength, reducing the density and continuity of the material, such as porosity and porosity, and producing stress concentration, such as membranous inclusions.