Medium-strength high-toughness die-casting aluminum alloy material for building aluminum template, and preparation method thereof

The invention relates to the technical field of aluminum alloy materials, in particular to a medium-strength high-toughness die-casting aluminum alloy material for a building aluminum template, and a preparation method thereof. The medium-strength high-toughness die-casting aluminum alloy material for the building aluminum template comprises, by weight, 1.0%-2.0% of Fe, 4.6%-6.5% of Mg and 0-4.5% of Zn, wherein the total content of impurities is smaller than 1%, and the content of single impurity is smaller than 0.2%; and the balance is aluminum. In the die-casting aluminum alloy material, an alloying method is adjusted, and a certain die-casting process is combined; a standard tensile sample is adopted for performance testing, and therefore the medium-strength high-toughness die-casting aluminum alloy material is obtained. Through lots of alloying experimental studies, it is found that, with increase of the magnesium content and the zinc content, the yield strength can be increased to 145 MPa or above, and t