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Li Zhang,Xiaoqian Li,Ripeng Jiang,Ruiqing Li,Lihua Zhang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
The microstructural modification of eutectic phase is a crucial factor for the mechanical properties strengthening of the Al–Cu binary alloy. In this paper, Al–6.2% Cu melts were subjected to ultrasonic treatment from 710 or 660 °C with differentdurations. The microstructural evolutions of primary α-Al grains and α-Al + θ-Al2Cu eutectic phase under ultrasonicationwere investigated based on the nucleation and growth behavior. Results indicated that with the increase of ultrasonic processingtime, the growth of dendritic or petaloid grains were completely suppressed and noticeable refinement to globularmorphology were observed for α-Al grains. Meanwhile, broad lamella-like eutectic structure transformed to debris or evenparticles with continuous ultrasonication. Accordingly, the area fraction, average length and width of coarsening eutecticlamellas were dramatically reduced. In addition, the decrease of coarsening eutectic phase rather than the refinement ofα-Al grains was found to be the main contributor to the enhancement of mechanical properties for Al–6.2% Cu alloy. Themechanisms underlying the transformation of eutectic phase under ultrasonic treatment was also interpreted based on theexperimental results.