| Metal lamellar composite material is a new type of metal composite material which is obtained by layering two or more kinds of metal sheets with different physical and chemical properties.It inherits the excellent performance of each component and makes up the deficiency of each component.The study of the variation of thickness and thickness ratio of each aluminum layer in the process of composite sheet rolling has important theoretical guiding significance for the formulation of Al/Al composite sheet rolling system.Al/Al multilayer composite sheet with high strength and plasticity is prepared,which provides further theory and scientific basis for the application of aluminum alloy in engineering.In this paper,1060/6061 aluminum/aluminum composite sheets were prepared by hot rolling method,and the effects of rolling deformation and rolling temperature on the mechanical properties,bonding properties,interface microstructure and texture of the composite sheets were studied by using advanced analytical instruments such as metallographic microscope(OM),scanning electron microscope(SEM)and universal testing machine.By analyzing the strength and bonding performance of laminated composite sheets at different rolling temperature and rolling deformation,the best rolling composite process was determined.The mechanical properties of 1060/6061 aluminum alloy multilayer composite sheets were studied by means of tensile testing machine and metallographic microscope.Cold rolling or solid solution aging treatment were carried out on the composite sheets prepared by tandem rolling respectively,and their mechanical properties were tested and compared by tensile testing machine.Based on the analysis and discussion of experimental data,the following conclusions are drawn:1060/6061 aluminum/aluminum composite sheet can be combined with the critical pressure down amount of 35%,in the rolling temperature of 400 ℃,rolling pressure down amount of 40%～50% range to obtain the best interface bonding effect.The plastic deformation of 1060 pure aluminum is not sensitive to the change of temperature,while the plastic deformation of 6061 aluminum alloy is more sensitive to the change of temperature.When the rolling reduction is lower than 40%,the deformation capacity of 1060 pure aluminum is stronger.The deformation capacity of6061 aluminum alloy is stronger when the rolling reduction is above 50%,and the deformation capacity is equivalent between 40% and 50%.At 400 ℃,the elongation of 1060/6061 aluminum/aluminum composite sheets are not sensitive to the change of the rolling reduction,and are mainly limited by the rolling temperature.The yield strength of the multi-layer composite sheet increased from 259 MPa at5 layers to 326 MPa at 80 layers.The tensile strength increased from 196 MPa at 5layers to 300 MPa at 80 layers.The elongation rate was 4.4% at the 5 layers,reached the highest 10% at the 20 layers,and then decreased to 6.4% at the 80 layers.After cold rolling,the tensile strength of 80-layer laminated sheet was increased to 420 MPa.Total elongation becomes 1.27%.After cold rolling,obvious second phase particles exist at the interface.After large plastic deformation occurs to the plate,strong plastic instability occurs to the 6061 aluminum layer.When the aging time of solution was prolonged,the strength of composite sheets showed a rising trend,reached a peak at 15 h aging,and then decreased with the increase of aging temperature.The elongation increases with the aging time,and decreases at 25 h compared with 20 h.By comparing the properties of cold-rolled and aged sheets,it is found that the diffusion effect of Mg and Si atoms due to temperature is less than the hardening effect. |
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