High-temperature-resistant high-strength aluminum alloy and preparation method thereof

[0035] Step 1: Weigh Al, Mg, master alloy Al-25 Cu, master alloy Al-25 Sc, master alloy Al according to the weight percentage of 5% Cu, 2% Mg, 0.3% Sc, 0.2% Zr, and the balance is Al -10 Zr;

[0036] Step 2: sending Al, Mg, master alloy Al-Cu, master alloy Al-Sc, and master alloy Al-Zr into the preheating kettle for preheating at a temperature of 130°C;

[0037] Step 3: First put Al and Mg into the melting tank for melting operation, add after Al and Mg are completely melted, raise the temperature to 725°C, add the master alloy Al-Cu, master alloy Al-Sc, master alloy Al-Zr, until the material melts;

[0038] Step 4: After the material is melted, remove the scum on the surface and raise the temperature to 774°C;

[0039] Step 5: Cool down to 713°C, pour into a mold that has been preheated to 250°C for casting, and air-cool to room temperature to obtain the aluminum alloy;

[0040] Step 6: Put the aluminum alloy obtained in Step 5 into a heating furnace and heat it at 480°C for

[0043] Step 1: Weigh Al, Mg, master alloy Al-25 Cu, master alloy Al-25 Sc, master alloy Al according to the weight percentage of 6% Cu, 3% Mg, 0.5% Sc, 0.5% Zr, and the balance is Al -10 Zr;

[0044] Step 2: sending Al, Mg, master alloy Al-Cu, master alloy Al-Sc, and master alloy Al-Zr into the preheating kettle for preheating at a temperature of 140°C;

[0045]Step 3: First put Al and Mg into the melting tank for melting operation, add after Al and Mg are completely melted, raise the temperature to 735°C, add the master alloy Al-Cu, master alloy Al-Sc, master alloy Al-Zr, until the material melts;

[0046] Step 4: After the material is melted, remove the scum on the surface and raise the temperature to 782°C;

[0047] Step 5: Cool down to 737°C, pour into a mold that has been preheated to 250-350°C for casting, and air-cool to room temperature to obtain the aluminum alloy;

[0048] Step 6: Put the aluminum alloy obtained in step 5 into a heating furnace and heat it at 500°C f

[0051] Step 1: Weigh Al, Mg, master alloy Al-25 Cu, master alloy Al-25 Sc, master alloy Al according to the weight percentage of 5.5% Cu, 2.5% Mg, 0.4% Sc, 0.35% Zr, and the balance is Al -10 Zr;

[0052] Step 2: sending Al, Mg, master alloy Al-Cu, master alloy Al-Sc, and master alloy Al-Zr into the preheating kettle for preheating at a temperature of 135°C;

[0053] Step 3: First put Al and Mg into the melting tank for melting operation, add after Al and Mg are completely melted, raise the temperature to 730°C, add the master alloy Al-Cu, master alloy Al-Sc, master alloy Al-Zr, until the material melts;

[0054] Step 4: After the material is melted, remove the scum on the surface and raise the temperature to 778°C;

[0055] Step 5: Cool down to 725°C, pour into a mold that has been preheated to 300°C in advance for casting, and cool down to room temperature in air to obtain the aluminum alloy;

[0056] Step 6: Put the aluminum alloy obtained in Step 5 into a heating furnace a