Enhancement of corrosion resistance of a high Zn-yttrium aluminum alloy
| Autor: | Yang Yuqi, Qi Xiao, Fang Jiawen, HengGang Si, Ping Yan, Wenjing Wang, Zhang Zhiyong, ChenXi Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Mechanical Engineering Diffusion Alloy Metals and Alloys Analytical chemistry Intermetallic chemistry.chemical_element 02 engineering and technology Yttrium engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Corrosion chemistry Mechanics of Materials Aluminium Materials Chemistry engineering Grain boundary 0210 nano-technology Solid solution |
| Zdroj: | Journal of Alloys and Compounds. 817:152744 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.152744 |
| Popis: | 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 Al-based solid solution into a more stable intermetallic compound of MgZn2-type. |
| Databáze: | OpenAIRE |
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