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- Title
Microstructure, Interface and Strengthening Mechanism of Ni-CNTs/AZ91 Magnesium Matrix Composites.
- Authors
Liu, Zhengzheng; Qin, Shaoyong; Wang, Wuxiao; Liu, Jian; Liu, Dongchao; Chen, Xiaogang; Li, Wuzhao; Mei, Bingchu
- Abstract
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 (Mg17Al12) phase. Mg2Ni 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.
- Subjects
MAGNESIUM; MICROSTRUCTURE; MAGNESIUM alloys; ALUMINUM-magnesium alloys; TENSILE strength; BOND strengths; METALLIC composites
- Publication
Materials (1996-1944), 2022, Vol 15, Issue 22, p7946
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma15227946