Effect of Ultrasonic Treatment on Grain Structure, Eutectic Phase and Mechanical Properties of an Al–6.2 wt% Cu Alloy

Li Zhang; Xiaoqian Li; Ripeng Jiang; Ruiqing Li; Lihua Zhang

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자료유형: 학술저널

저자정보: Li Zhang (Central South University) Xiaoqian Li (Central South University) Ripeng Jiang (Central South University) Ruiqing Li (Central South University) Lihua Zhang (Central South University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.5

발행연도: 2021.1

수록면: 1,282 - 1,295 (14page)

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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.

#Ultrasonic treatment · α-Al phase · α-Al + θ-Al2Cu eutectic phase · Mechanical properties

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