Die-cast aluminum alloy material and method for preparing same

Abstract

The invention discloses novel high strength die-cast aluminum alloy material and a method for preparing the same. The novel die-cast aluminum alloy material takes the aluminum (Al) as the substrate and comprises the following elements by weight percent: 10-12 percent of silicon (Si), 0.5-1.0 percent of manganese (Mn), 0.5-3.0 percent of copper (Cu), 0-0.5 percent of titanium (Ti), 0.5 percent of ferrum (Fe) or less, 0-0.8 percent of other elements and the balance of aluminum (Al). The method for preparing the novel die-cast aluminum alloy material comprises the following steps: melting an pure aluminum ingot; keeping the heat of the melted pure aluminum ingot at 700-750 DEG C; adding the industrial Si, the industrial Cu, the Mn and the Ti to the melted pure aluminum ingot according to the formula, and stirring the industrial Si, the industrial Cu, the Mn, the Ti and the melted pure aluminum ingot with a mechanical stirrer; keeping the heat of the mixture for 30-60min; removing the slag and the gas with hexachloroethane for 10min; and modifying the mixture with the universal ternary modifier. Through improving the components of the die-cast aluminum alloy, the microstructure and the refined grain of the die-cast aluminum alloy in the crystallizing and the solidifying process are controlled, the morphology of the Si-Fe compound in the die-cast aluminum alloy is changed, the mechanical property of the die-cast part is improved, the elements in the die-cast aluminum alloy are dissolved in the substrate to form the solid solution, and the mechanical property of the die-cast aluminum alloy is improved.

Description

technical field [0001] The invention relates to an alloy metal material and a preparation method thereof, in particular to a novel high-strength die-casting aluminum alloy material and a preparation method thereof. Background technique [0002] Al-Si series alloys have good fluidity, dense castings, and are not easy to produce casting cracks. They have good casting performance, corrosion resistance and moderate cutting performance. They are ideal casting alloys and have become the most valued in the manufacturing industry. One of the structural materials. However, the mechanical properties of cast Al-Si alloys are not satisfactory at present, the strength and hardness are average, and the toughness is low. With the development of modern industry, traditional casting technology and cast Al-Si alloys can no longer meet the growing social needs. Therefore, it is of great significance to research and develop high-strength cast Al-Si alloys. [0003] At present, the strengtheni...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of poor strength and toughness of existing Al-Si alloy die castings, the purpose of the present invention is to provide a die casting aluminum alloy material and its preparation method without changing the existing die casting process and increasing the cost a lot To improve the strength and toughness of Al-Si alloy die castings and expand the application range of Al-Si alloy die castings