Microstructure regulation and synergistic deformation of heterogeneous laminated magnesium alloy during roll bonding

Mg/Mg laminated metal composites (LMCs) have great application potential due to low density and excellent comprehensive properties. In this work, AZ31/LZ91 LMCs were prepared by roll bonding. However, due to the difference in microstructure and strength plasticity of the two alloys, the deformation resistance and plastic deformation ability of the two alloys were quite different, and the synergistic deformation of the two alloys during roll bonding cannot be achieved, so the matrix alloy has the problem of cracking. Therefore, aiming at the problem of cracking of the matrix alloy, systematic study was carried out, the causes of cracking were analyzed, and feasible improvement methods were proposed. Finally, AZ31/LZ91 LMCs with surface smooth, flat and crack-free were successfully prepared by regulating the microstructure of the two alloys and optimizing the roll bonding process. Meanwhile, the synergistic deformation mechanism and interface bonding mechanism of the two alloys during roll bonding were discussed.