Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 817, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152744
Keywords
Aluminum 7xxx alloys; Al-Zn-Mg(-Cu)-Y; High (Zn, Y) and low Cu-content; Corrosion resistance; Hardness
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Funding
- National Natural Science Foundation of China [51861010]
- China Scholarship Council [201808360070]
- Jiangxi Education Department of China [GJJ170512]
- Jiangxi Science Department of China [20161BAB206138]
- Jiangxi University of Science and Technology, China
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The corrosion resistance of a high Zn (11 wt%) aluminum alloy was found to be significantly improved by 45% when doped with Y (solid solution limit 1.4 wt %), while the hardness of the material is only reduced by 3.5%. Although corrosion is frequently observed in the grain boundaries of high Zn aluminum alloys, it is not observed in the grain boundary of the Y-included alloys under current approach, in spite of the increased volume of grain boundary phases. The content of Mg and Zn decreased in the grain boundary precipitates as the Y content increases, leading to an increase of the corrosion potential of these grain boundary phases. The calculated atomic binding energies, diffusion energies and surface energies suggested that Y substitution has improved the binding forces between alloy elements Mg, Cu, Zn and Al, but has a different effect on Cr. The precipitates in grain boundaries appear to have converted from the Albased solid solution into a more stable intermetallic compound of MgZn2-type. (C) 2019 Elsevier B.V. All rights reserved.
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