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논문 기본 정보

자료유형
학술저널
저자정보
Zijian Cheng (Nanchang University) Hong Yan (Nanchang University) Shuqing Zhang (Nanchang University) Xiuliang Zou (Nanchang University) Chuanliang Cao (Key Laboratory of Light Alloy Preparation and Processing in Nanchang City)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.9
발행연도
2024.9
수록면
2,490 - 2,502 (13page)
DOI
10.1007/s12540-024-01654-4

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초록· 키워드

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The effects of rare earth La on the microstructure, hardness, and corrosion resistance of A356 aluminum alloy were investigatedby optical microscopys, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Theexperimental results showed that with the addition of rare earth La, the microstructure was refined, and both Si phases andβ-Al5FeSi phases were transformed from long needle-like to short rod-like. The optimal microstructure and mechanicalproperties of the alloy were obtained when 0.6 wt% La was added. Compared with A356 aluminum alloy (88.36 HV), thehardness of A356 aluminum alloy modified with 0.6 wt% La (106.83 HV) was increased by 20.1%. The results of the immersioncorrosion test and electrochemical experiments showed that the corrosion current density of A356 aluminum alloymodified with 0.6 wt% La (132.51 μA cm−2) was 24.8% lower than that of the matrix (176.24 μA cm−2), and the polarizationresistance (668.56 Ω cm2)was 235.2% higher than that of the matrix (199.47 Ω cm2). This may be because the addition ofrare earth La significantly reduced the cathode phases grain size in the corrosion micro-battery as well as the formation ofintermetallic compounds containing rare earth La, leading to a decrease in the reaction rate of the cathode during corrosion.

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