Rib And Groove Interlocking Rolling Composite Process And Microstructure And Properties Study Of Cu/Al

Metal layered composite materials have wide application prospect and scientific research value.It has always been hot issues of research to improve the bonding strength of composite materials by optimizing the composite process.In this paper,industrial pure copper T1 and industrial pure aluminum 1060 were selected as raw materials.A new rib and groove interlocking rolling composite process was proposed to prepare Cu/Al composite plate.The influence of reduction rate and rib and groove interlocking structure on the interface morphology and mechanical properties of composite plate was studied.Through the combination of numerical simulation and experimental research,the interface microstructure evolution and composite mechanism and strengthening mechanism during rib and groove interlocking rolling composite process of Cu/Al were studied.Finally,the influence of different annealing processes on interfacial bonding quality of Cu/Al composite plate was studied.The main research contents and results are as follows:（1）Preparation of Cu/Al composite plate at different reduction rates by rib and groove interlocking rolling composite process.Scanning electron microscopy was used to observe the interface morphology of the composite plate in the rolling direction and transverse direction at typical position,and tensile and shear tests were used to test the mechanical properties of the composite plate in the rolling direction and transverse direction,and the tensile fracture morphology and shear section morphology were observed.The results show that the actual ultimate tensile strength of the composite plate in the rolling direction and in the transverse direction is higher than the theoretical value of 7.2-76.8 MPa in the range of 50%-60%of reduction rate.The highest interfacial shear strength in rib and groove interlocking structure 0°direction in rolling direction at the same reduction rate,which is about 13.0-27.8%higher than that in the rolling direction plane position.The critical reduction rate of55%was determined for during rib and groove interlocking rolling composite process of Cu/Al.Comparing the new and conventional rolling composite process in terms of both microscopic interface morphology and mechanical properties.It was found that the interfacial shear strength of the composite plate with rib and groove interlocking structure increased by 15.3%compared with that of the composite plate without rib and groove interlocking structure when the reduction rate was 55%.（2）ABAQUS finite element software was used to set up a two-dimensional finite element model of rib and groove interlocking rolling process of Cu/Al at 55%reduction rate.And the reliability of the model was verified.The variation of the equivalent strain and equivalent stress in the rolling direction composite interface were predicted.OM and EBSD was used to observe the interfacial microstructure of the composite plate in the rolling direction and transverse direction at typical position.The interface microstructure evolution and composite mechanism and strengthening mechanism during rib and groove interlocking rolling composite process of Cu/Al were studied.The results show that the local deformation caused by rib and groove interlocking structure will further intensify the elongation and refinement of the grains near the interface,and the effect of deformation strengthening and fine grain strengthening of the composite interface is enhanced,which makes bonding strength of the composite plate improved.（3）Cu/Al composite plate with 55%reduction rate prepared by rib and groove interlocking rolling composite process.The effects of different annealing temperatures and different annealing times on thickness and composition of Interface diffusion layer of Cu/Al composite plate were investigated by SEM,EDS,XRD,etc.Mechanical properties of the composite plate were tested by peeling tests and micro-hardness tests.The results show that the thickness of interfacial diffusion layer increases with the increase of annealing temperature and time for Cu/Al composite plate,the diffusion layer composition is mainly Cu Al₂,Cu Al and Cu₉Al₄,and the optimum annealing process is 300℃/2 h.At this time,the peeling strength of both the plane and the rib and groove interlocking reaches the maximum value of 10.73 N/mm and 11.02 N/mm.The above results confirmed the feasibility of the rib and groove interlocking rolling composite process.It provides a new path to improve the interfacial bonding strength of metal layered composite material.