Abstract
The trade-off of strength and toughness limits the development of magnesium matrix composites. In this paper, the strong interface bonding and uniform dispersion of carbon nanotubes (CNTs) were achieved in CNTs reinforced magnesium matrix (CNTs/Mg) composite through electroless copper plating of CNTs, ball milling, sintering and extrusion. The composite was characterized by SEM, HRTEM, tensile test, etc. The structure characterization shows that the CuMg2 interfacial phase, with coherent and semi-coherent interface, forms by the reaction between the decorated copper of CNTs and the magnesium matrix, thus improving the interfacial bonding. Furthermore, CNTs are uniformly distributed at the grain boundary, which hinder the process of discontinuous dynamic recrystallization and play the role of grain refinement. As a result, the strengthening and toughening efficiency of CNTs/Mg composite reach 325% and 264%, respectively, by adding only 0.125 vol% of CNTs. The calculation model of its strength is established.
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