Preparation method of high-strength cast aluminum alloy

[0028] Example 1, aluminum alloy components and their weight ratio: 5.00% Zn, 4.00% Ni, 1.50% Mg, 2.80% Cu, 0.20% Mn, 0.15% Cr, and the rest is Al. The alloy preparation steps are as follows:

[0029] Configure 30kg of alloy according to the composition requirements, and heat it at 720°C after melting;

[0030] The alloy melt is treated by the rotary injection method for 10 minutes;

[0031] Adding 0.2% by weight of TiC nano-ceramic particles, the particle size distribution range of the nano-ceramic particles is 50-200nm;

[0032] The melt is subjected to power ultrasonic treatment, the ultrasonic power is 500W, the melt treatment temperature is 680°C, and the treatment time is 3min;

[0033] Cast at 720°C by squeeze casting method;

[0034] The casting cast alloy is subjected to solid solution treatment, specifically 465°C / 6h+500°C / 3h, and finally cooled by water quenching;

[0035] The alloy after solution treatment is subjected to aging treatment, specifically 120°C / 4

[0037] Example 2, aluminum alloy components and their weight ratios: 7.00% Zn, 4.50% Ni, 1.50% Mg, 1.40% Cu, 0.20% Mn, 0.15% Cr, 0.02% Sc and the rest being Al. The alloy preparation steps are as follows: Configure 100kg of alloy according to the composition requirements, and heat it at 690°C after melting;

[0038] The alloy melt is processed by the rotary injection method for 30 minutes;

[0039] Adding 0.6% by weight of TiC nano-ceramic particles, the particle size distribution range of the nano-ceramic particles is 50-200nm;

[0040] The melt is subjected to power ultrasonic treatment, the ultrasonic power is 800W, the melt treatment temperature is 700°C, and the treatment time is 3min;

[0041] Casting at 700°C by gravity sand casting method;

[0042] The casting cast alloy is subjected to solid solution treatment, specifically 465°C / 6h+500°C / 3h, and finally cooled by water quenching;

[0043] The alloy after solution treatment is subjected to aging treatment, specifi

[0045] Example 3, aluminum alloy components and their weight ratio: 6.00% Zn, 4.50% Ni, 2.40% Mg, 1.80% Cu, 0.20% Mn, 0.15% Cr, and the rest is Al. The alloy preparation steps are as follows:

[0046] Configure alloy 300kg according to the composition requirements, and heat it at 690°C after melting;

[0047] The alloy melt is processed by the rotary injection method for 30 minutes;

[0048] Adding 0.6% by weight of TiC nano-ceramic particles, the particle size distribution range of the nano-ceramic particles is 50-200nm;

[0049] The melt is subjected to power ultrasonic treatment, the ultrasonic power is 1000W, the melt treatment temperature is 700°C, and the treatment time is 3min;

[0050] Casting at 700°C by low-pressure casting method;

[0051] The casting cast alloy is subjected to solid solution treatment, specifically 465°C / 6h+500°C / 3h, and finally cooled by water quenching;

[0052] The alloy after solution treatment is subjected to aging treatment, specifically