Microstructures and tensile behavior of carbon nanotubes reinforced Cu matrix composites with molecular-level dispersion

A new process of molecular-level mixing was used to fabricate successfully the Cu–carbon nanotubes (CNTs) composite powders. The phase composition and microstructures of the composite powders were studied. Cu–CNTs composites with molecular-level dispersion have been fabricated by spark plasma sintering, and then the composites were successfully hot rolled up to 50% reduction. The tensile behavior and fractographs of the composites have been studied, the results indicate that a little amount of CNTs added in the Cu matrix can remarkably improve the tensile strength and yield strength of Cu matrix. With a higher degree of CNTs dispersion, the yield strength and tensile strength of the Cu–CNTs composites can obviously improve, but the special elongation decreases greatly.

► Cu–CNT composite powders with molecular-level dispersion were fabricated.
► The Cu–5 vol% CNTs composites were successfully hot rolled up to 50% reduction.
► CNTs can remarkably improve the tensile and yield strength of Cu composites.
► The elongation of composites with molecular-level dispersion decreases greatly.