Effect of Ce addition on microstructures and mechanical properties of A380 aluminum alloy prepared by squeeze-casting

Xiao-hui Ao¹，Shu-ming Xing¹，Bai-shui Yu¹，Qing-you Han²

1. School of Mechanical Electronic and Control Engineering,Beijing Jiaotong University2. Department of Mechanical Engineering Technology,Purdue University

摘 要：The effect of cerium（Ce）addition on the eutectic Si,β-Al₅Fe Si phase,and the tensile properties of A380 alloy specimens prepared by squeeze-casting were studied by optical microscopy（OM）,scanning electron microscopy（SEM）,and X-ray diffraction（XRD）.The experimental results showed that Ce more effectively modified the eutectic Si and refined theβ-Al₅Fe Si.The refinement effect significantly increased under a specific pressure of 100 MPa with the addition of Ce from 0.1wt%to 0.9wt%.In contrast,the average length and the aspect ratio of the eutectic Si andβ-Al₅Fe Si exhibited their optimal values when the content of the added Ce was greater than 0.5wt%.Needle-like Al₈Cu₄Ce was precipitated with the addition of excessive Ce;hence,the mechanical properties of A380 gradually decreased with increasing Ce content in the range from 0.3wt%to 0.9wt%.

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