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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Bibliographic Details
Published in:Materials 2022-11, Vol.15 (22), p.7946
Main Authors: Liu, Zhengzheng, Qin, Shaoyong, Wang, Wuxiao, Liu, Jian, Liu, Dongchao, Chen, Xiaogang, Li, Wuzhao, Mei, Bingchu
Format: Article
Language:English
Subjects:
Alloys
Bonding strength
Carbon
Cleavage
Composite materials
Dimpling
Dispersion
Elongation
Fracture surfaces
Magnesium alloys
Magnesium base alloys
Mechanical properties
Medical equipment
Metal matrix composites
Morphology
Powder metallurgy
Semisolids
Strengthening
Tensile strength
Ultrasonic imaging
Ultrasonic processing
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Summary: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 Al ) phase. Mg 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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15227946