Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites
Ni-CNTs/AZ91 magnesium matrix composites were fabricated by ultrasound treatment combined with a semi-solid stirred method for the first time. The agglomerated spherical Ni-CNTs transferred from spherical shape to clear tubular shape after pre-dispersion treatment. For the Ni-CNTs/AZ91 magnesium mat...
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MDPI AG
2022-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/22/7946 |
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| author | Zhengzheng Liu Shaoyong Qin Wuxiao Wang Jian Liu Dongchao Liu Xiaogang Chen Wuzhao Li Bingchu Mei |
| author_facet | Zhengzheng Liu Shaoyong Qin Wuxiao Wang Jian Liu Dongchao Liu Xiaogang Chen Wuzhao Li Bingchu Mei |
| author_sort | Zhengzheng Liu |
| collection | DOAJ |
| description | Ni-CNTs/AZ91 magnesium matrix composites were fabricated by ultrasound treatment combined with a semi-solid stirred method for the first time. The agglomerated spherical Ni-CNTs transferred from spherical shape to clear tubular shape after pre-dispersion treatment. For the Ni-CNTs/AZ91 magnesium matrix composite prepared by semi-solid stirring followed by ultrasonic treatment, Ni-CNTs were evenly distributed in the magnesium matrix or wrapped on the β (Mg<sub>17</sub>Al<sub>12</sub>) phase. Mg<sub>2</sub>Ni were formed at the interface of the magnesium matrix and CNTs by in-situ reaction, which significantly improved the interface bonding strength of CNTs and the Mg matrix. The tensile strength and elongation of 1.0wt.% Ni-CNTs/AZ91 magnesium matrix composites were improved by 36% and 86%, respectively, compared with those of AZ91 matrix alloy. After Ni-CNTs were added to AZ91 matrix alloy, more dimples were observed at the fracture surface. The fracture behavior of Ni-CNTs/AZ91 composite was transformed from a cleavage fracture of AZ91 matrix alloy to a quasi-cleavage fracture. Meanwhile, the CNTs dispersed near the fracture showed a “pull-out” state, which would effectively bear and transfer loads. The strengthening mechanism of CNTs was also discussed. |
| first_indexed | 2024-03-09T18:12:49Z |
| format | Article |
| id | doaj.art-717a4a699f42457988507dc36b5f8144 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:12:49Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-717a4a699f42457988507dc36b5f81442023-11-24T09:01:35ZengMDPI AGMaterials1996-19442022-11-011522794610.3390/ma15227946Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix CompositesZhengzheng Liu0Shaoyong Qin1Wuxiao Wang2Jian Liu3Dongchao Liu4Xiaogang Chen5Wuzhao Li6Bingchu Mei7School of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaFaculty of Printing, Packaging Engineering and Digital Media Technology, Xi’an University of Technology, Xi’an 710054, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSchool of Material Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, ChinaNi-CNTs/AZ91 magnesium matrix composites were fabricated by ultrasound treatment combined with a semi-solid stirred method for the first time. The agglomerated spherical Ni-CNTs transferred from spherical shape to clear tubular shape after pre-dispersion treatment. For the Ni-CNTs/AZ91 magnesium matrix composite prepared by semi-solid stirring followed by ultrasonic treatment, Ni-CNTs were evenly distributed in the magnesium matrix or wrapped on the β (Mg<sub>17</sub>Al<sub>12</sub>) phase. Mg<sub>2</sub>Ni were formed at the interface of the magnesium matrix and CNTs by in-situ reaction, which significantly improved the interface bonding strength of CNTs and the Mg matrix. The tensile strength and elongation of 1.0wt.% Ni-CNTs/AZ91 magnesium matrix composites were improved by 36% and 86%, respectively, compared with those of AZ91 matrix alloy. After Ni-CNTs were added to AZ91 matrix alloy, more dimples were observed at the fracture surface. The fracture behavior of Ni-CNTs/AZ91 composite was transformed from a cleavage fracture of AZ91 matrix alloy to a quasi-cleavage fracture. Meanwhile, the CNTs dispersed near the fracture showed a “pull-out” state, which would effectively bear and transfer loads. The strengthening mechanism of CNTs was also discussed.https://www.mdpi.com/1996-1944/15/22/7946Ni-CNTmagnesium matrix compositesstrengthening mechanismultrasonic treatmentsemi-solid stirring |
| spellingShingle | Zhengzheng Liu Shaoyong Qin Wuxiao Wang Jian Liu Dongchao Liu Xiaogang Chen Wuzhao Li Bingchu Mei Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites Materials Ni-CNT magnesium matrix composites strengthening mechanism ultrasonic treatment semi-solid stirring |
| title | Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites |
| title_full | Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites |
| title_fullStr | Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites |
| title_full_unstemmed | Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites |
| title_short | Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites |
| title_sort | microstructure interface and strengthening mechanism of ni cnts az91 magnesium matrix composites |
| topic | Ni-CNT magnesium matrix composites strengthening mechanism ultrasonic treatment semi-solid stirring |
| url | https://www.mdpi.com/1996-1944/15/22/7946 |
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