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Al–Cu3–Si–Mg wheel hubs were prepared by molten metals die forging (MMDF). The as-cast microstructure morphology of the alloy formed under pressure was observed by optical microscope and scanning electron microscope. The granular phases  θ  (Al 2 Cu) were distributed in the  α –Al grains, and the cross phases  β  (Mg 2 Si) grew near the grain boundary in the  α –Al grains. Polygonal compounds  φ  (Al x Ti 9 La 2 Ce 6 Cu) and irregular eutectic structures mainly formed by ( α  + Al 2 Cu) eutectic formed under non-equilibrium solidification were found at the grain boundaries. Q (Al 5 Cu 2 Mg 8 Si 6 ) phases were found at the intersection of grain boundaries. With the increase of pressure, the proportion of irregular eutectic structures ( α  + Al 2 Cu) decreased from 7.3% to 5.2%. Combined with microstructure analysis and thermodynamic software analysis, the non-equilibrium solidification path was determined as follows:  L  →  L  +  φ  →  L  +  α  +  φ  →  L  + ( α  +  e ) +  α  +  φ  → ( α  +  e ) +  Q  +  α  +  φ  → ( α  +  e ) +  Q  + [ α  +  θ ] +  φ  → ( α  +  e ) +  Q  + [ α  +  θ  +  β ] +  φ

Study on non-equilibrium solidification microstructure of Al–Cu3–Si–Mg alloy by MMDF