Influence of Transition Metals Ti and Co on Interfacial Microstructure and Strength of Copper-graphene Composites

Transition metals Ti and Co were separately introduced into copper-graphene composites by matrix alloying and powder metallurgy methods.The effects of Ti and Co on the strength of copper-graphene composites were compared by tensile test.The microstructure and interface structure of copper/graphene composites were characterized by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）and Raman spectroscopy.With addition of Ti,a large number of nano TiC particles were formed on the interface,which promoted the interface bonding without increasing graphene defects,and the tensile strength increased from 223 MPa to 256 MPa.Nevertheless,amorphous carbon appeared at the interface of Co doped composites.It increased graphene defects and was not conducive to play the role of strengthening phase and transferring interface load,resulting in the strength decreased from 223 MPa to 192 MPa.