Intermediate-strength aluminium alloy rod and preparation method thereof

The invention discloses a preparation method for an intermediate-strength aluminium alloy rod. The preparation method comprises the following steps: smelting an aluminium ingot, aluminium-silicon alloy, aluminium-iron alloy, a magnesium ingot and aluminium-tombarthite alloy at 720-750 DEG C to form an alloy liquid, then degassing and refining at 730-740 DEG C, then standing at 720-730 DEG C for 30-50 min, and casting to obtain an ingot; adjusting and controlling alloy liquid components before casting, wherein the adjusted and controlled alloy liquid comprises the following components in percentage by weight: smaller than or equal to 0.30% of alloy, 0.30-0.50% of silicon, 0.30-0.50% of magnesium, 0.10-0.15% of tombarthite and the balance of aluminium; performing water cooling on the obtained ingot, then conducting hot rolling, and cooling so as to obtain a hot rolled aluminium alloy rod; conducting artificial aging on the obtained hot rolled aluminium alloy rod, wherein the artificial aging temperature is 150-160 DEG C, and the artificial aging time is 3.5-4 h, so as to obtain the intermediate-strength aluminium alloy rod. The invention further discloses the intermediate-strength aluminium alloy rod obtained by adopting the preparation method for the intermediate-strength aluminium alloy rod.