Lattice severe deformation rolling (LSDR) for bimetal laminated composite preparation

Bimetal laminated composite has gained more and more attention as it owns excellent physical, chemical and mechanical properties of both the component metals. Rolling is a common method to prepare such hybrid materials. However, since there is generally significant material property difference between the two metal plates and the quality of the rolled products is restrained by many processing parameters, defects such as low bonding strength, high residual stress, serious warpage and edge cracks are difficult to avoid in the laminated composite. A novel preparation method denominated as Lattice Severe Deformation Rolling (LSDR) is proposed in the present paper that applying a specially designed cross-corrugated roll on the difficult-to-deform metal plate for the first-pass rolling. The plates undergo local severe shearing strains twice through the whole rolling process, which is beneficial for refining the grains and improving the mechanical properties of the laminated composite. Commercial AZ31B magnesium alloy plate and 5052 aluminum alloy plate are selected to perform the confirmatory experiment. The results indicate that AZ31B Mg/5052 Al laminated composite can be produced with high bonding strength, slight warpage and edge cracks. LSDR is considered as a promising method for high-quality bimetal laminated composite preparation.