Preparation method of aluminum alloy, fine-grain aluminum alloy and application of fine-grain aluminum alloy

The invention discloses a preparation method of a fine-grain aluminum alloy, the fine-grain aluminum alloy and application of the fine-grain aluminum alloy, and relates to the technical field of aluminum alloys. The preparation method comprises the following steps that a 6-series aluminum alloy ingot is sequentially subjected to extrusion treatment, cold forging treatment, off-line solution treatment and aging treatment; the temperature of the extrusion treatment is 300 DEG C to 400 DEG C. Compared with a conventional cold forging production process of the 6-series aluminum alloy, the preparation method is simpler in process, and the prepared aluminum alloy is finer in crystal grain, more uniform in distribution and better in mechanical comprehensive performance and decoration performance. 本发明公开了一种细晶铝合金的制备方法、细晶铝合金及其应用，涉及铝合金技术领域。该制备方法包括以下步骤：将6系铝合金锭依次进行挤压处理、冷锻处理、离线固溶处理、时效处理；所述挤压处理的温度为300℃～400℃。相较于6系铝合金的常规冷锻生产工艺，该制备方法工艺更为简单，且制得的铝合金的晶粒更加细小、分布更加均匀，力学综合性能和装饰性更好。