A Comparative Study on the Effect of Four-Source Ultrasonic Power on the Microstructure and Mechanical Properties of Large-Scale 2219 Aluminum Ingots
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High-intensity ultrasound was introduced into the direct chill casting of large-scale 2219 aluminum alloy ingots (1380 mm in diameter and 4600 mm in length). The effects of four-source ultrasonic irradiation with various powers on the morphologies, size of α-Al grains and Al2Cu precipitated phase as well as the mechanical properties of the ingots were compared. The results indicated that, when the total real-time power of the ultrasonic system was maintained at 4030 W, a grain-refined structure with a more uniformly dispersed Al2Cu precipitated phase was obtained in the ingot. The mechanical properties of the ingot cast under a total power of 4030 W was also better than the ingots cast under 3600 W and 4420 W. It was found that the stress concentration caused by large area of coarse Al2Cu phase in the ingots under 3600 W and 4420 W resulted in the deterioration of mechanical properties.
This work was supported by the National Natural Science Foundation of China (Grant No. U1637601, No. 51475480, No. 51575539), the State Key Laboratory of High Performance Complex Manufacturing of Central South University (Contract No. ZZYJKT2017-01) and the Project of Innovation-driven Plan for Postgraduate in Central South University (No. 2017zzts104).
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