Optical Aluminum Alloy and a Preparation Method Thereof

A preparation method of an optical aluminum alloy, wherein the preparation method comprises the following steps:

• step S1, preparing an original aluminum alloy cast ingot from raw materials by adopting a semi-continuous casting process, wherein the semi-continuous casting process comprises subjecting the raw materials to heating melting, alloying, refining, slagging-off, standing, degassing, filtering and semi-continuous water-cooling casting;
• step S2, subjecting the original aluminum alloy cast ingot to homogenization, head and tail cutting and skin turning, to obtain a surface treated alloy raw material;
• step S3, subjecting the surface treated alloy raw material to rapid solidification treatment through a melt spinning method to obtain a rapid solidification alloy strip;
• step S4:
• subjecting the rapid solidification alloy strip to crushing treatment and then to sheathing and cold pressing, to obtain a cold pressed blank;
• step S5, subjecting the cold pressed blank to 1-2 passes of hot extrusion procedures to prepare a bar;
• and
• step S6, subjecting the bar to solution treatment and aging treatment, to obtain the finished aluminum alloy material.