Study On Design,Preparation And Strengthening And Toughening Behavior Of Multilayer Cu/Ni Composites

The new Laminated metal composites represented by multilayer Cu / Ni composites are widely used in related manufacturing industries such as batteries,electrical components,and shipbuilding.In order to further improve the mechanical properties of multilayer Cu /Ni composites and make them more selective in practical applications,we plan to introduce graphene as a non-uniformly distributed reinforcing phase into the Cu / Ni interface,aiming to make use of graphite and fabricate the high performance multilayer Cu/Ni compositesThis paper first of all introduces the process of dispersing graphene in metal matrix composites by electrodeposition technology and traditional rolling method,then studies the mechanism of strengthening the mechanical properties of Cu / Ni composites by discontinuous graphene films.Finally,the effects of graphene films on the interface of Cu-based composites under different layer ratios are discussed.The results obtained in this article are as follows:(1)The effect of the thickness of graphene film after hot rolling on the microstructure and tensile properties of the multilayer Cu / Ni composite interface was studied.Combined with the shear hysteresis model,it was found that when the thickness of the graphene film was about 4.12 ?m,the tensile strength and elongation at break were 398 MPa and 44.3%,respectively,and the toughening effect was relatively obvious.Studies had shown that after rolling at 800°C,the graphene films are mostly distributed in the form of particles or chains between the Cu / Ni interface,hinders the asymmetric diffusion behavior of Cu and Ni elements,and reduced the formation of Kirkendal holes at the interface.It was beneficial to strengthen the interface and delayed the uneven deformation phase of the composite material;when the composite material was under load,the discontinuous graphene film could effectively bear part of the load,thereby improved the strength of the multilayer Cu /Ni composite material.(2)The Interface microstructure and tensile properties of multilayer Cu/Gr/Ni composites with different cold rolling reduction ratios of 20%,40%,60% and 80% were studied respectively.The microstructure showed that as the cold rolling reduction increased,the discontinuous graphene film was continuously shattered and dispersed between the Cu /Ni interface.The shattering could be seen through the mechanical properties.After the composite material with a graphene film thickness of about 4.12 ?m has a cold rolling reduction of 20%-80%,the strength of the Cu / Ni composite material was increased by 80 MPa,53 MPa,47 MPa and 35 MPa,however,since the graphene film gradually shreds as the reduction ratio increases,the effect of strengthening the load transfer gradually decreased.(3)The graphene / Cu-based composite at different layer ratios(1: 1,1: 2,1: 4)was studied.Microstructure and mechanical properties of materials.The test showed that when the layer ratio was 1: 1,the interface was relatively straight,and the graphene film had a stronger strengthening and toughening effect on the copper-based composite material.The tensile strength and elongation at break were 272 MPa and 58.3%,respectively.After the hot rolling of composite materials with a ratio of 1: 2,1: 4,the interface was bend and aggregate.When the irregular interface was under load,microcracks were generated due to stress concentration,which reduced the interface bonding strength and reduced the mechanical properties of the composite.