Semi-solid die-casting aluminum alloy material and die-casting molding method using same

Abstract

A semi-solid die-casting aluminum alloy material comprises 6%-9% of Si, 0-0.3% of Cu, 0.25%-0.55% of Mn, 0.2%-0.5% of Mg, 0.6%-1.2% of Fe, 0-0.15% of Ni, 0-0.15% of Zn, 0-0.15% of Pb, 0-0.05% of Sn, 0-0.2% of Ti, 0-0.15% of impurities, and the balance Al. The content of Si is controlled to be 6%-9% and the content of Fe is controlled to be 0.6%-1.2%, so that the good die-casting molding performance, corrosion resistance and demoulding effect are ensured; meanwhile, 0.25%-0.55% of Mn is added to form a MnAl6 compound, so that the harmful effect of iron is effectively weakened; also, Mn can hinder the recrystallization process of aluminum alloy, the recrystallization temperature is increased, and favorable conditions are provided for the semi-solid pulping process of alloy slurry; in addition, 0.2%-0.5% of Mg is contained properly so as to improve the tensile strength.

Description

technical field [0001] The invention relates to an alloy material and a die-casting method thereof, in particular to a semi-solid die-casting aluminum alloy material and a die-casting molding method using the material. Background technique [0002] Semi-solid die-casting refers to strong stirring during the solidification process of liquid metal, so that the dendrite network skeleton that is easy to form in ordinary casting is broken to form a dispersed granular structure, thereby making semi-solid metal liquid, and then Die cast into billets or castings. [0003] In the ordinary casting process, the primary crystals grow up in the form of dendrites. When the solid phase ratio reaches about 0.2, the dendrites form a continuous network skeleton and lose macroscopic fluidity. Semi-solid die-casting is to carry out strong stirring during the cooling process of liquid metal from liquid phase to solid phase, so that the dendrite network skeleton that is easy to form during ordin...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a semi-solid die-casting aluminum alloy material and a method for die-casting molding using the material. The main purpose of the invention is to overcome the defects that ordinary casting is easy to form dendrites and lose macro fluidity, which is not conducive to die-casting.