Mechanical Properties Of Aluminum-magnesium Laminated Composite Calculation And Rolling Composite Technology,

Using aluminum alloys as protective layers, the corrosion resistance and the wear resistance of the magnesium substrate in Al/Mg/Al laminated composite can be improve effectively, while maintaining another excellent properties of the alloys. The laminated composite has extensive applications.In this work, the mechanical properties of the Al/Mg/Al tri-layer composite were calculated based on Classical Laminate Theory (CLT). The entrance conditions and the hot rolling process were analyzed using the Finite-Element Method (FEM). Properties of the composite prepared by hot rolling were tested. The bonding mechanism was investigated. The influences of the rolling temperature and the reduction on the bonding strength were studied.The calculations of first layer failure strength based on Classical Laminate Theory agree with the experimental data in the error of 4% to 16%. Thus, the first layer failure strength of the Al/Mg/Al trilaminated composite fabricated by hot rolling can be calculated by Classical Laminate Theory with the maximum stress criteria. With the increasing of the aluminum alloy relative thickness, the tensile rigidity, bending rigidity, special tensile rigidity, tensile strength and special tensile strength increased, the special bending rigidity increased and then decreased.Analyzing the entrance prerequisite of the multi-layered assembly, it can be concluded that the driving force between the Al and Mg alloy plates when the Al alloy plates touched the rollers must be taken into account in addition to the entrance prerequisite valid for one plate entering the rolling mill. The results indicated that the assemblies with a straight front-end can not entrance but that with a slad shap front-end can. In the experimental range of reduction ratio and rolling temperature, an initial bonding can be generated. The initial bonding increased with the reduction ratio. On the other hand, increasing the reduction ratio will damage the bonding more severity. Increasing of the rolling temperatue also has positive and negative effects on the bonding.The 7075 Al alloy plate will not be bonded with the AZ31 Mg alloy plate after the hot rolling until the reduction ratio was larger than 50%. The bonding strength decreased with the reduction ratio and the rolling temperature. The maximum bonding strength of the composite was 65MPa. A suited technique to prepare the composite was that the rolling temperature was 400℃and the reduction ratio was 60% (in a single pass). The bonding process can be divided into three stages:generation of surface cracks, mechanical combine and atomic inter diffusion.