Introduction
Bimonthly, started in 1957
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
Administrator
Shanxi Provincial Education Department
Sponsor
Taiyuan University of Technology
Publisher
Ed. Office of Journal of TYUT
Editor-in-Chief
SUN Hongbin
ISSN: 1007-9432
CN: 14-1220/N
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Effect of Graphene Powder on Microstructure and Properties of Magnesium Matrix Composites
DOI:
10.16355/j.cnki.issn1007-9432tyut.2019.06.015
Received:
Accepted:
| Corresponding author | Institute | |
| CHEN Jin | College of Materials Science and Engineering, Taiyuan University of Technology |
abstract:
The combination of mechanical alloying and Field Actived and Pressure Assited Synthesis(FAPAS) was used to prepare pure Mg and powdered graphene/Mg(GNPs/Mg) composites. The effects of powdered graphene on the microstructure and properties of aluminum matrix composites were investigated. A high differential charge density and a strong hybrid and covalent interaction between C atom and the Mg atom of Mg(100) plane reduced the preparation defects of the matrix material, improved the interfacial bonding strength of GNPs/Mg composite, improved the dislocation density of the matrix material, increased the resistance of the grain boundary to dislocation movement during deformation, reduced the potential difference between the electrodes by etching the current, enhanced the electrochemical reaction resistance of the electrode surface of GNPs/Mg composite, and consequently, passivated the surface of the composite. When graphene mass fraction was 0.1%, the thermal conductivity and electrical conductivity of GNPs/Mg composites increased by 2.3% and 14.6% respectively, the hardness and strength by 10% and 25% respectively, and the corrosion resistance by 89.1%. With increasing graphene content, the defect concentration of interface increased, and the interfacial bonding strength of the composite was lowered, resulting in a decrease in the performance of GNPs/Mg composite. In summary, the optimum addition amount of powder graphene was 0.5% by mass.
Keywords:
graphene powder;Mg matrix composites;microstructure;properties