*2.3. Experimental Procedures*

The experiment was performed on a horizontal two-roll continuous cast rolling unit. Four groups of continuous casting and rolling experiments were carried out on the 1060 aluminum alloy: (1) adding 0.18 wt% Al-Ti-B refiner, conventional casting and rolling; (2) adding 0.18 wt% Al-Ti-B refiner and applying an ultrasonic bending vibration; (3) adding 0.12 wt% Al-Ti-B refiner and applying an ultrasonic bending vibration; (4) adding 0.09 wt% Al-Ti-B refiner and applying an ultrasonic bending vibration. The process of the 1060 aluminum alloy ultrasonic-assisted twin-roll continuous casting and rolling is shown in Figure 2.

**Figure 2.** Schematic (**a**) and field picture (**b**) of the continuous casting and rolling of the 1060 aluminum alloy.

The technological parameters of the twin-roll casting unit were as follows: the roll gap was 5.7 mm, the twin roll casting speed was 0.85 m/min, the pouring temperature of the aluminum melt measured by the thermocouple was 695 ◦C, the temperature of the cooling water inlet in the roll was 34 ◦C, the water outlet was 41 ◦C, and the water pressure was 0.9 MPa. The parameters of the ultrasonic equipment were as follows: the power of ultrasonic wave was 800 W, the frequency was 21 ± 0.2 kHz, and the ceramic radiator was inserted into the aluminum melt surface in the launder at about 50 mm.
