Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy
Grain refinement is a crucial technique for enhancing the mechanical properties and corrosion resistance of magnesium alloys. In this study, the addition of 0.3 wt% CaO and 0.3 wt% CaCO3 successfully refined the AM60 alloy, resulting in a significant reduction in the average grain size from 326 μm t...
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| Language: | English |
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Elsevier
2024-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424006070 |
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| author | Qi-feng Li Wei Qiu Wen Xie Yan-jie Ren Jian Chen Mao-hai Yao Tang-qing Wu Li-bo Zhou Wei Li Wei Chen Xiang-jun Li |
| author_facet | Qi-feng Li Wei Qiu Wen Xie Yan-jie Ren Jian Chen Mao-hai Yao Tang-qing Wu Li-bo Zhou Wei Li Wei Chen Xiang-jun Li |
| author_sort | Qi-feng Li |
| collection | DOAJ |
| description | Grain refinement is a crucial technique for enhancing the mechanical properties and corrosion resistance of magnesium alloys. In this study, the addition of 0.3 wt% CaO and 0.3 wt% CaCO3 successfully refined the AM60 alloy, resulting in a significant reduction in the average grain size from 326 μm to 96 μm (when adding CaCO3). The refined grain size of the as-cast AM60 alloy led to an increase in both tensile strength and yield strength to 118.2 MPa and 72.6 MPa, representing a respective increase of 35% and 23% compared to the alloy without the refiner. As results of EBSD, it is verified that the basal slip system (0001)<112‾0> has a higher Schmid factor after adding CaO, which indicates that this system has higher activity. The substitution reaction between CaO and Mg can produce synergistic effects from the solute effect of Ca and the nucleating effect of residual CaO, which play an important role in grain refinement. Due to the fine grain size and diffuse distribution of the second phase in the AM60-CaCO3 alloy and the thermal decomposition of CaCO3, which consumes the aluminum element in the matrix, the content of the β-phase (Mg17Al12) is reduced. Consequently, this reduces the electric coupling effect between the β-phase and the magnesium matrix. The AM60-CaCO3 alloy exhibited the most superior corrosion resistance, achieving a corrosion rate of only 1.01 mm y−1, representing a 48.9% reduction in corrosion rate compared to the AM60 alloy. |
| first_indexed | 2024-04-24T23:17:55Z |
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| id | doaj.art-ee51d106e63341768b6cbb5e5edcc719 |
| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-04-24T23:17:55Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj.art-ee51d106e63341768b6cbb5e5edcc7192024-03-17T07:54:34ZengElsevierJournal of Materials Research and Technology2238-78542024-05-0130307317Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloyQi-feng Li0Wei Qiu1Wen Xie2Yan-jie Ren3Jian Chen4Mao-hai Yao5Tang-qing Wu6Li-bo Zhou7Wei Li8Wei Chen9Xiang-jun Li10School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Corresponding author. School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China.School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Hunan Rare Earth Metal Material Research Institute, Institute of Rare Earth Light Alloys, Changsha, 410126, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaHunan Rare Earth Metal Material Research Institute, Institute of Rare Earth Light Alloys, Changsha, 410126, ChinaSchool of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaSchool of Energy and Power Engineering, Changsha University of Science & Technology, Changsha, Hunan, 410114, China; Key Laboratory of Energy Efficiency and Clean Utilization, The Education Department of Hunan Province, Changsha University of Science & Technology, Changsha, Hunan, 410114, ChinaGrain refinement is a crucial technique for enhancing the mechanical properties and corrosion resistance of magnesium alloys. In this study, the addition of 0.3 wt% CaO and 0.3 wt% CaCO3 successfully refined the AM60 alloy, resulting in a significant reduction in the average grain size from 326 μm to 96 μm (when adding CaCO3). The refined grain size of the as-cast AM60 alloy led to an increase in both tensile strength and yield strength to 118.2 MPa and 72.6 MPa, representing a respective increase of 35% and 23% compared to the alloy without the refiner. As results of EBSD, it is verified that the basal slip system (0001)<112‾0> has a higher Schmid factor after adding CaO, which indicates that this system has higher activity. The substitution reaction between CaO and Mg can produce synergistic effects from the solute effect of Ca and the nucleating effect of residual CaO, which play an important role in grain refinement. Due to the fine grain size and diffuse distribution of the second phase in the AM60-CaCO3 alloy and the thermal decomposition of CaCO3, which consumes the aluminum element in the matrix, the content of the β-phase (Mg17Al12) is reduced. Consequently, this reduces the electric coupling effect between the β-phase and the magnesium matrix. The AM60-CaCO3 alloy exhibited the most superior corrosion resistance, achieving a corrosion rate of only 1.01 mm y−1, representing a 48.9% reduction in corrosion rate compared to the AM60 alloy.http://www.sciencedirect.com/science/article/pii/S2238785424006070Mg alloysCaCO3Grain refinementMicrostructureTransmission electron microscopy |
| spellingShingle | Qi-feng Li Wei Qiu Wen Xie Yan-jie Ren Jian Chen Mao-hai Yao Tang-qing Wu Li-bo Zhou Wei Li Wei Chen Xiang-jun Li Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy Journal of Materials Research and Technology Mg alloys CaCO3 Grain refinement Microstructure Transmission electron microscopy |
| title | Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy |
| title_full | Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy |
| title_fullStr | Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy |
| title_full_unstemmed | Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy |
| title_short | Comparative study of CaO and CaCO3 on microstructure refinement, mechanical and corrosion resistance of AM60 alloy |
| title_sort | comparative study of cao and caco3 on microstructure refinement mechanical and corrosion resistance of am60 alloy |
| topic | Mg alloys CaCO3 Grain refinement Microstructure Transmission electron microscopy |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424006070 |
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