Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure
The Mg–4Zn-0.5Y-0.5Nd alloy was designed and fabricated using conventional casting and subsequently heat treatment to optimize its microstructure and corrosion properties. The effects of secondary phase morphology and grain structure on the in vitro corrosion behavior of the alloy were systematicall...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000626 |
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| author | C.C. Zhao W.T. Ouyang M. Wen C. Yang D.K. Xu Y.F. Zheng T.F. Xi L.Y. Sheng |
| author_facet | C.C. Zhao W.T. Ouyang M. Wen C. Yang D.K. Xu Y.F. Zheng T.F. Xi L.Y. Sheng |
| author_sort | C.C. Zhao |
| collection | DOAJ |
| description | The Mg–4Zn-0.5Y-0.5Nd alloy was designed and fabricated using conventional casting and subsequently heat treatment to optimize its microstructure and corrosion properties. The effects of secondary phase morphology and grain structure on the in vitro corrosion behavior of the alloy were systematically investigated to elucidate the corresponding mechanisms. The results show that the T4 treatment coarsens the equiaxed grains and transforms the secondary phase into thin cell skeleton structure with a slight decrease in area fraction. While the T6 treatment reconstructs the secondary phase into bulk ones along the grain boundary and fine ones inside the grain. The T4 treatment changes the corrosion potential and current density of the alloy obviously, but these values are changed by the T6 treatment a little. The As–C alloy has the highest corrosion rate of 0.91 mg cm−2 d−1, while the T4 alloy with solid solution treatment decreases to 0.65 mg cm−2 d−1, and the T6 alloy has a middle value between them. Such a corrosion behavior should be mainly ascribed to the evolution of secondary phase morphology and distribution caused by heat treatment. The Mg–Zn–Y-Nd alloys with different states all experience passivation, pitting corrosion, galvanic corrosion, localized corrosion, and extensive corrosion stages, but the duration time of different stages of different alloys differs obviously, which is mainly determined by the secondary phase morphology. Comparatively, the secondary phase with thin cell skeleton structure contributes to corrosion resistance, while the isolated bulk secondary phase accelerates the corrosion. Moreover, the appropriate coarsened grain structure is also beneficial to corrosion resistance. |
| format | Article |
| id | doaj-art-b70f1d1a79b04f0dbc46ce8229c70fc1 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-b70f1d1a79b04f0dbc46ce8229c70fc12025-01-13T04:18:56ZengElsevierJournal of Materials Research and Technology2238-78542025-03-0135435450Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structureC.C. Zhao0W.T. Ouyang1M. Wen2C. Yang3D.K. Xu4Y.F. Zheng5T.F. Xi6L.Y. Sheng7PKU-HKUST ShenZhen-HongKong Institution, Shenzhen, 518057, China; Shenzhen Institute, Peking University, Shenzhen, 518057, ChinaNingbo Institute of Materials Technology and Engineering, CAS, Ningbo, 315201, ChinaPKU-HKUST ShenZhen-HongKong Institution, Shenzhen, 518057, China; Shenzhen Institute, Peking University, Shenzhen, 518057, ChinaNational Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Corresponding author.Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaShenzhen Institute, Peking University, Shenzhen, 518057, ChinaPKU-HKUST ShenZhen-HongKong Institution, Shenzhen, 518057, ChinaPKU-HKUST ShenZhen-HongKong Institution, Shenzhen, 518057, China; Shenzhen Institute, Peking University, Shenzhen, 518057, China; Corresponding author. PKU-HKUST ShenZhen-HongKong Institution, Shenzhen, 518057, China.The Mg–4Zn-0.5Y-0.5Nd alloy was designed and fabricated using conventional casting and subsequently heat treatment to optimize its microstructure and corrosion properties. The effects of secondary phase morphology and grain structure on the in vitro corrosion behavior of the alloy were systematically investigated to elucidate the corresponding mechanisms. The results show that the T4 treatment coarsens the equiaxed grains and transforms the secondary phase into thin cell skeleton structure with a slight decrease in area fraction. While the T6 treatment reconstructs the secondary phase into bulk ones along the grain boundary and fine ones inside the grain. The T4 treatment changes the corrosion potential and current density of the alloy obviously, but these values are changed by the T6 treatment a little. The As–C alloy has the highest corrosion rate of 0.91 mg cm−2 d−1, while the T4 alloy with solid solution treatment decreases to 0.65 mg cm−2 d−1, and the T6 alloy has a middle value between them. Such a corrosion behavior should be mainly ascribed to the evolution of secondary phase morphology and distribution caused by heat treatment. The Mg–Zn–Y-Nd alloys with different states all experience passivation, pitting corrosion, galvanic corrosion, localized corrosion, and extensive corrosion stages, but the duration time of different stages of different alloys differs obviously, which is mainly determined by the secondary phase morphology. Comparatively, the secondary phase with thin cell skeleton structure contributes to corrosion resistance, while the isolated bulk secondary phase accelerates the corrosion. Moreover, the appropriate coarsened grain structure is also beneficial to corrosion resistance.http://www.sciencedirect.com/science/article/pii/S2238785425000626Mg–Zn–Y-Nd alloyHeat treatmentMicrostructureSecondary phaseCorrosion behavior |
| spellingShingle | C.C. Zhao W.T. Ouyang M. Wen C. Yang D.K. Xu Y.F. Zheng T.F. Xi L.Y. Sheng Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure Journal of Materials Research and Technology Mg–Zn–Y-Nd alloy Heat treatment Microstructure Secondary phase Corrosion behavior |
| title | Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure |
| title_full | Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure |
| title_fullStr | Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure |
| title_full_unstemmed | Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure |
| title_short | Optimizing corrosion resistance of the Mg–4Zn-0.5Y-0.5Nd alloy by regulation of secondary phase and grain structure |
| title_sort | optimizing corrosion resistance of the mg 4zn 0 5y 0 5nd alloy by regulation of secondary phase and grain structure |
| topic | Mg–Zn–Y-Nd alloy Heat treatment Microstructure Secondary phase Corrosion behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000626 |
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