Strengthening of the magnesium matrix composites hybrid reinforced by chemically oxidized carbon nanotubes and in situ Mg2Sip

Aggregation and weak interfacial bonding limit the superior strengthening potential of the carbon nanotubes (CNTs) in the metal matrix composites. To overcome these challenges, in situ Mg2Si nanoparticles (Mg2Sip) have been hybridized with surface modified CNTs through chemical oxidization. The syne...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-03, Vol.858, p.157673, Article 157673
Main Authors: Li, Pubo, Tan, Wanting, Gao, Mangmang, Shi, Keren
Format: Article
Language:English
Subjects:
Bonding strength
Carbon nanotubes
Elongation
Interfacial bonding
Load transfer
Magnesium compounds
Magnesium matrix composites
Mechanical properties
Metal matrix composites
Metal silicides
Nanoparticles
Particulate composites
Powder thixoforming
Strengthening
Synergistic strengthening
Thermal mismatch
Thixoforming
Ultimate tensile strength
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Summary:Aggregation and weak interfacial bonding limit the superior strengthening potential of the carbon nanotubes (CNTs) in the metal matrix composites. To overcome these challenges, in situ Mg2Si nanoparticles (Mg2Sip) have been hybridized with surface modified CNTs through chemical oxidization. The synergistic strengthening was enhanced by tailoring the volume ratios of CNTs to Mg2Sip in the Mg matrix through powder thixoforming technology. Herein, when 0.3CNTs-1.2Mg2Sip was added, a yield strength, ultimate tensile strength, and elongation of 213 MPa, 271 MPa, and 6.3%, respectively, were obtained, which were 18.3%, 16.8%, and 3.3% higher than those of the 0.75CNTs-0.75Mg2Sip/Mg composites, respectively. The strengthening effects of the CNTs-Mg2Sip reinforcements were more effective than those of the individual 1.5CNTs and 1.5Mg2Sip owing to the effective thermal mismatch and load transfer strengthening mechanisms. In this study, we propose an effective approach to harness the superior performances of the hybrid reinforcements for enhancing the composites. [Display omitted] •The distribution of CNTs-Sip was improved by hybridizing oxidized CNTs and Sip.•In-situ oxide is formed at the defect sites of oxidized CNTs and Mg2Sip/Mg interface.•Adjusting the content ratio of CNTs-Mg2Sip optimizes the mechanical properties.•The strengthening mechanism is analyzed through strengthening model.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.157673