The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite
Microstructure evolution and mechanical properties of the aging treated AlN/AZ91 composites were systematically investigated by optical microscopy (OM), high resolution scanning electron microscopy (HRSEM) with an energy dispersive spectrum (EDS), and high-angle annular dark field scanning transmiss...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-07-01
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| Series: | Journal of Magnesium and Alloys |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956722000378 |
| _version_ | 1827267615413764096 |
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| author | Yunxia Sun Changlin Yang Bin Zhang Jianfeng Fan Hongxiang Li Tianhao Zhao Jing Li |
| author_facet | Yunxia Sun Changlin Yang Bin Zhang Jianfeng Fan Hongxiang Li Tianhao Zhao Jing Li |
| author_sort | Yunxia Sun |
| collection | DOAJ |
| description | Microstructure evolution and mechanical properties of the aging treated AlN/AZ91 composites were systematically investigated by optical microscopy (OM), high resolution scanning electron microscopy (HRSEM) with an energy dispersive spectrum (EDS), and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The results show that the higher fracture elongation (14 ± 1%) and ultimate tensile strength (275 ± 6 MPa) were simultaneously obtained in the peak-aged AlN/AZ91 composites. Comparied with AZ91 matrix alloy, the strength was increased by about 44% and the elongation was approximately five times higher, which mainly attributed to the precipitation of nano-sized γ-Mg17Al12 phase and the activation of non-basal slip systems induced by in-situ AlN particles at room temperature. However, the in-situ formation of AlN reinforcements consumed part of Al element in the matrix alloy, which resulted into the volume fraction decreasing of γ-Mg17Al12 precipitates, and then the age hardening and strengthening efficiency were reduced in the AlN/AZ91 composites. On the other hand, the mismatch of thermal expansion coefficient between AlN particles and AZ91 matrix generated high density dislocations around AlN particles, which promoted the precipitation of γ-Mg17Al12 phase, and then the peak aging time and temperature were decreased. |
| first_indexed | 2024-03-12T02:50:29Z |
| format | Article |
| id | doaj.art-954e5c5a4d144860a715b69e18c291e3 |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2025-03-22T04:36:34Z |
| publishDate | 2023-07-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-954e5c5a4d144860a715b69e18c291e32024-04-28T00:43:56ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-07-0111724582468The aging behavior, microstructure and mechanical properties of AlN/AZ91 compositeYunxia Sun0Changlin Yang1Bin Zhang2Jianfeng Fan3Hongxiang Li4Tianhao Zhao5Jing Li6State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China; Yangtze River Delta Research Institute of NPU, Taicang, Jiangsu 215400, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China; Yangtze River Delta Research Institute of NPU, Taicang, Jiangsu 215400, PR China; Corresponding author at: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shanxi 710072, PR China.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China; Yangtze River Delta Research Institute of NPU, Taicang, Jiangsu 215400, PR ChinaKey Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China; Yangtze River Delta Research Institute of NPU, Taicang, Jiangsu 215400, PR ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China; Yangtze River Delta Research Institute of NPU, Taicang, Jiangsu 215400, PR ChinaMicrostructure evolution and mechanical properties of the aging treated AlN/AZ91 composites were systematically investigated by optical microscopy (OM), high resolution scanning electron microscopy (HRSEM) with an energy dispersive spectrum (EDS), and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). The results show that the higher fracture elongation (14 ± 1%) and ultimate tensile strength (275 ± 6 MPa) were simultaneously obtained in the peak-aged AlN/AZ91 composites. Comparied with AZ91 matrix alloy, the strength was increased by about 44% and the elongation was approximately five times higher, which mainly attributed to the precipitation of nano-sized γ-Mg17Al12 phase and the activation of non-basal slip systems induced by in-situ AlN particles at room temperature. However, the in-situ formation of AlN reinforcements consumed part of Al element in the matrix alloy, which resulted into the volume fraction decreasing of γ-Mg17Al12 precipitates, and then the age hardening and strengthening efficiency were reduced in the AlN/AZ91 composites. On the other hand, the mismatch of thermal expansion coefficient between AlN particles and AZ91 matrix generated high density dislocations around AlN particles, which promoted the precipitation of γ-Mg17Al12 phase, and then the peak aging time and temperature were decreased.http://www.sciencedirect.com/science/article/pii/S2213956722000378Magnesium matrix compositesIn-situ AlN particlesAging behaviorMicrostructureMechanical properties |
| spellingShingle | Yunxia Sun Changlin Yang Bin Zhang Jianfeng Fan Hongxiang Li Tianhao Zhao Jing Li The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite Journal of Magnesium and Alloys Magnesium matrix composites In-situ AlN particles Aging behavior Microstructure Mechanical properties |
| title | The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite |
| title_full | The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite |
| title_fullStr | The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite |
| title_full_unstemmed | The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite |
| title_short | The aging behavior, microstructure and mechanical properties of AlN/AZ91 composite |
| title_sort | aging behavior microstructure and mechanical properties of aln az91 composite |
| topic | Magnesium matrix composites In-situ AlN particles Aging behavior Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2213956722000378 |
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