Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy

Chong-yu Liu; Guang-biao Teng; Zong-yi Ma; Li-li Wei; Bing Zhang; Yong Chen

doi:10.1007/s12613-019-1840-7

Volume 26 Issue 12

Dec. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(12): 1559-1569

Chong-yu Liu, Guang-biao Teng, Zong-yi Ma, Li-li Wei, Bing Zhang, and Yong Chen, Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1559-1569. https://doi.org/10.1007/s12613-019-1840-7

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Chong-yu Liu, Guang-biao Teng, Zong-yi Ma, Li-li Wei, Bing Zhang, and Yong Chen, Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1559-1569. https://doi.org/10.1007/s12613-019-1840-7

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Research Article

Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy

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Corresponding authors:
Chong-yu Liu E-mail: lcy261@glut.edu.cn

Zong-yi Ma E-mail: zyma@imr.ac.cn
Received: 1 January 2019; Revised: 5 March 2019; Accepted: 6 March 2019

Abstract

Abstract

The effects of Sc and Zr microalloying on the microstructure and mechanical properties of a 7xxx Al alloy with high Cu content (7055) during casting, deformation, and heat treatment were investigated. The addition of Sc and Zr not only refined the grains but also transformed the θ-phase into the W-phase in the 7055 alloy. Minor Sc and Zr additions enhanced the hardness and yield strength of the 7055-T6 alloy by strengthening the grain boundaries and Al₃(Sc,Zr) precipitates. However, a further increase in the Sc and Zr fractions did not refine the grains but instead resulted in the formation of the large-sized W-phase and primary coarse Al₃(Sc,Zr) phase and subsequently deteriorated the mechanical properties of the alloys. The 7055 alloy with 0.25Sc addition exhibited the best mechanical property among the prepared alloys.
- aluminum alloys;
- microstructural evolution;
- mechanical property;
- grain refinement

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