Study on the Effect of Ultrasonic Wave on the Segregation of Large Size 2A14 Aluminum Alloy Ingot

Abstract

Abstract In the casting process of 2A14 aluminum alloy with a diameter of 830 mm, the ingots obtained under the condition of ultrasonic treatment and without ultrasonic treatment were compared and evaluated. For the ingot without ultrasonic treatment, the maximum local concentrations of copper and silicon on the cross section were 5.41 % and 1.22 %, respectively. For the ingot with ultrasonic treatment, the maximum concentrations of copper and silicon were 5.1 % and 1.12 %, respectively, and the reduction of copper and silicon in the center of the ingot was 5.7 % and 8.2 %, respectively. The macro-segregation was improved as a whole. Scanning electron microscopy observation showed that the eutectic structure areas without ultrasonic treatment were 42.3 %, 37.8 %, and 32.4 %, respectively, at 25 mm, 175 mm, and 325 mm from the center of the ingot. For the ingot with ultrasonic treatment, the eutectic structure areas at the corresponding positions were 34.8 %, 32.6 %, and 28.8 %, respectively, which were reduced by 17.7 %, 13.7 %, and 11.1 %, respectively. On the cross section, the average tensile strength, average yield strength, and average elongation of the ingot with ultrasonic treatment were increased by 5.6 %, 6.7 %, and 1.5 %, respectively, compared with the ingot without ultrasonic treatment, which improved the performance of the ingot on the cross section as a whole.