Critical Quenching Rate for High Hardness and Good Exfoliation Corrosion Resistance of Al-Zn-Mg-Cu Alloy Plate

Dongfeng Li; Bangwen Yin; Yue Lei; Shengdan Liu; Yunlai Deng; Xinming Zhang

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자료유형: 학술저널

저자정보: Dongfeng Li (Central South University) Bangwen Yin (Central South University) Yue Lei (Central South University) Shengdan Liu (Central South University) Yunlai Deng (Central South University) Xinming Zhang (Central South University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.2

발행연도: 2016.1

수록면: 222 - 228 (7page)

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By means of the end-quenching technique, we investigated the relationship between quenching rate and hardness as well as exfoliation corrosion rating for Al-2.21 Zn-3.59 Mg-0.45 Cu-0.038 Zr (at%) alloy plate. In order to achieve an exfoliation corrosion rating of P or EA, the quenching rate must be greater than approximately 460 °C/min and 300 °C/min, respectively, and the drop degree in hardness should simultaneously be lower than approximately 2.0% and 3.5%, respectively. The results of microstructural and microchemical examination using a scanning transmission electron microscope indicate that a lower quenching rate leads to a higher content of Zn, Mg, and Cu in the grain-boundary particles and a greater width of precipitate-free zones near grain boundaries; therefore, grain-boundary particles with Zn and Mg contents less than approximately 13.39% and 10.23% (at%), respectively, and precipitate-free zones near grain boundaries with widths less than about 107 nm can contribute to an exfoliation corrosion rating better than EA. The amount of quench-induced η- phase particles, which lead to lower hardness, increases with decreasing quenching rate, and the area fraction of these particles is approximately 2.9% at a quenching rate of 300 °C/min.

참고문헌 (29)

참고문헌 신청

S. Liu / 2015 / J. Alloy. Compd 625:34

Y. Deng / 2011 / J. Alloy. Compd 509:4636

S. Liu / 2010 / Mater. Design 31:3116

S. Y. Chen / 2012 / Trans. Nonferrous Met. Soc. China 22:47

S. D. Liu / 2015 / Corros. Sci 91:203

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