Enhancing long-term corrosion resistance of Zn modified high-Mg aluminum alloys through optimized stabilization treatment
Stabilization treatment is an effective way to improve the long-term corrosion resistance of low-Mg content (≤5 wt%) Al alloys due to the formation of discontinuous grain boundary β-Al3Mg2 precipitates. Increasing the Mg content can dramatically improve the strength of the alloy by Mg atom solid sol...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425016011 |
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| Summary: | Stabilization treatment is an effective way to improve the long-term corrosion resistance of low-Mg content (≤5 wt%) Al alloys due to the formation of discontinuous grain boundary β-Al3Mg2 precipitates. Increasing the Mg content can dramatically improve the strength of the alloy by Mg atom solid solution. However, achieving long-term corrosion resistance of such high-Mg (>6 wt%) aluminum alloys still poses a serious challenge. In this study to solve the trade-off between strength and long-term corrosion resistance, a synergistic approach combining Zn microalloying with optimized stabilization treatment parameters is employed to improve the comprehensive performance of Al-7wt.%Mg alloy. The Zn-containing alloy demonstrates enhanced spheroidization of GBPs and reduced Mg content in the matrix, both contributing to superior sensitization annealing performance. Theoretical modeling incorporating grain boundary diffusion mechanism and phase-interface interactions confirms that Zn-containing alloys exhibit a significant reduction in grain boundary phase elongation rate during accelerated sensitization compared with Zn-free counterparts. This research provides critical guidance for developing corrosion-resistant high-Mg aluminum alloys in marine engineering applications. |
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| ISSN: | 2238-7854 |