*3.2. E*ff*ect of the Ultrasonic Bending Vibration on the Precipitated Phases of the 1060 Aluminum Alloy Cast Rolling Strip and Subsequent Cold Rolling Strip*

The precipitated phases on the surface, longitudinal section, and cross section of the 1060 aluminum alloy cast rolling strips under different treatments are shown in Figure 5. It can be seen that on the upper surface, longitudinal section, and cross section, the precipitated phase of the conventional cast rolling strip with 0.18 wt% Al-Ti-B refiner is coarse, unevenly distributed, and enriched, and the slag inclusion defects are very obvious; meanwhile, the precipitated phases in the ultrasonic cast rolling strip with 0.18 wt% Al-Ti-B refiner or 0.12 wt% Al-Ti-B refiner are more dispersed and uniformly distributed, and there are no large slag inclusion defects. However, when the addition amount of the Al-Ti-B refiner is reduced to 0.09 wt%, the precipitated phases of the ultrasonic cast rolling strip tend to be coarsened and the slag inclusion defects increase. This shows that the ultrasonic bending vibration can make the precipitated phases of the 1060 cast rolling strip disperse and uniformly distributed to a certain extent, and can significantly reduce the slag inclusion defects in the cast rolling strip.

**Figure 5.** Precipitated phases of the 1060 aluminum alloy cast rolling strips: (**a**–**c**) the top surface, longitudinal section, cross section of the strip with added 0.18 wt% Al-Ti-B refiner and applied conventional treatment; (**d**–**f**) the top surface, longitudinal section, cross section of the strip with added 0.18 wt% Al-Ti-B refiner and applied ultrasonic treatment; (**g**–**i**) the top surface, longitudinal section, cross section of the strip with added 0.12 wt% Al-Ti-B refiner and applied ultrasonic treatment; (**j**–**l**) the top surface, longitudinal section, cross section of the strip with added 0.09 wt% Al-Ti-B refiner and applied ultrasonic treatment.

The precipitated phases on the surfaces of the 1060 aluminum alloy cast rolling strips after subsequent cold rolling under different treatments are shown in Figure 6. Compared with the subsequent cold rolling of the strip with conventional treatment, the ultrasonic cast rolling strip after cold rolling has a fine dispersed phase, a regular shape, and a relatively uniform distribution. This indicates that the solute elements in the material have uniformly diffused into the aluminum

matrix, which can reduce the degree of component segregation. However, the size, shape, and distribution of the precipitated phases are not uniform, and there is an obvious solute enrichment area in the conventional cast rolling strip with the 0.18 wt% Al-Ti-B refiner addition after cold rolling. In addition, compared with the three types of ultrasonic cast rolling strips with the addition of the Al-Ti-B refiner, the ultrasonic cast rolling strip with added 0.18 wt% Al-Ti-B refiner or 0.12 wt% Al-Ti-B refiner has fewer slag inclusion defects after the cold rolling.

**Figure 6.** The precipitated phases of the subsequent cold rolling of the 1060 aluminum alloy cast rolling strip: (**a**) the top surface of the strip with added 0.18 wt% Al-Ti-B refiner and applied conventional treatment; (**b**) the top surface of the strip with added 0.18 wt% Al-Ti-B refiner and applied ultrasonic treatment; (**c**) the top surface of the strip with added 0.12 wt% Al-Ti-B refiner and applied ultrasonic treatment; (**d**) the top surface of the strip with added 0.09 wt% Al-Ti-B refiner and applied ultrasonic treatment.
