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The quality of the round ingot is one of the major factors that constrain the final performance of the large ring for aerospace applications. Herein, to reduce the defects from the start, ultrasound is applied to assist the direct‐chill casting of the large‐scale ingot (1100 mm diameter, 4680 mm length). Results show that coarse dendritic or petaloid α‐Al grains are reduced with the highest refining...
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