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The influence of ultrasonic melt treatment (USMT) at different ultrasonic powers (0, 900, 2400, and 3000 W) on the morphology and chemical composition of Ni‐containing intermetallic phases (T‐Al9FeNi and δ‐Al3CuNi phases) in an Al‐11.5Si‐4Cu‐2Ni‐1Mg‐0.45Fe (wt%) piston alloy is investigated. The morphological characterization reveals that the USMT not only decrease the size of the T‐Al9FeNi and δ‐Al...