Synergistic effect of carbon nanotube and graphene nanoplatelet addition on microstructure and mechanical properties of
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ARTICLE Synergistic effect of carbon nanotube and grapheme nanoplatelet addition on microstructure and mechanical properties of AZ31 prepared using hot-pressing sintering Liqun Wu Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; and College of Materials Science and Engineering, Heilongjiang University of Science and Technology, Harbin 150022, China
Ruizhi Wua) Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; and College of Science, Heihe University, Heihe 164300, China
Jinghuai Zhang and Legan Hou Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China
Milin Zhang Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; and College of Science, Heihe University, Heihe 164300, China (Received 10 August 2018; accepted 19 October 2018)
Magnesium alloy (AZ31) reinforced with carbon nanotubes (CNTs) and grapheme nanoplatelets (GNPs) were fabricated with the method of hot-pressing sintering and hot extrusion processes. GNPs and CNTs were predispersed with Al and Zn powders by ball milling used as precursor for sintering, which effectively guaranteed the integrity and dispersion of them. The microstructure and mechanical properties of the composites (denoted as Mg–3 wt% Al–1 wt% Zn–1 wt% (xCNTs 1 yGNPs)(x:y 5 1:1, 1:2, 1:3) were investigated. The results show that the CNTs and GNPs are uniformly distributed in the matrix and closely combined with the matrix in nanoscale. Among the tested composites, Mg–3 wt% Al–1 wt% Zn–1 wt% (xCNTs 1 yGNPs)(x:y 5 1:2) exhibits the most favorable mechanical properties, and the yield strength, tensile and compressed strength, and elongation of composites are substantially improved by the addition of 0.33 wt% CNTs and 0.67 wt% GNPs. Novel strengthening mechanisms such as three-dimensional reinforced structure formed by CNTs and GNPs are found for the remarkable improvement in mechanical properties.
I. INTRODUCTION
As a kind of new materials with important potential applications, the carbon nanotubes (CNTs) and grapheme nanoplatelets (GNPs) have been arousing more and more research interest after they were found by Dr. Iijima,1 since they possess attractive properties, such as thermodynamics and mechanical properties. At present, the CNTs and GNPs have been considered as the ideal reinforcement of composites.2–4 Researchers have successfully prepared the polymer composites reinforced with CNTs and GNPs, respectively, which possess excellent mechanical properties. However, compared to the polymer composites, the metal matrix composites reinforced with CNTs or GNPs are limited by the stronger tendency to reunite, which is difficult to overcome by traditional preparation methods a)
Address all correspondence to this author. e-mail: [email protected], ruizhiwu2
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