Effect of hot rolling on interface microstructure and properties of cast-rolled T2 copper/AA5052 aluminum alloy composite plates
Horizontal twin-roll casting and rolling combined process is a near-final forming technology,but in order to meet the industrial requirements under different conditions,it is necessary to carry out subsequent rolling-thinning treatment.A 7 mm-thick T2 copper/AA5052 aluminum alloy composite plate was prepared by horizontal twin-roll casting and rolling composite technology.Scanning electron microscope(SEM),energy dispersive spec-trometer(EDS),X-ray diffraction(XRD),electronic universal testing machine and micro-hardness tester were used to study the interfacial morphology,interfacial microstructure and phases,interfacial bonding strength,interfacial peeling morphology and microhardness of this composite material after hot-rolling under different holding times.The results show that the thickness of the diffusion layer of the as-rolled plate is 3.66 μm,and the average peeling strength(APS)is 13.2 N/mm.With the extension of the holding time,firstly,it can pro-mote the atomic inter-diffusion to improve the bonding strength;secondly,it can improve the deformation coordination to prevent the destruction of the interface;thirdly,it can form a me-chanical occlusion in the direct contact area between the substrate on both sides and the in-termetallic compound(IMC)layer after rolling,which generates a mechanical locking force.The average peeling strength of the interface peaked at 28.3 N/mm at a holding time of 32 min.
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