Abstract
How to improve the bonding ability and quality performance of heterogeneous plates has always been one of the difficult problems in the field of high-performance heterogeneous composite sheet forming and manufacturing. In this paper, a new manufacturing method of heterogeneous clad plate, hard plate rolling clad plate, is proposed. The hot rolling process of Al/Mg/Al composite slab with or without hard plate was studied. The results show that the shear stress in the rolling direction (RD) can be transformed into the compressive stress in the normal direction (ND), and then the welding pressure between different composite layers can be increased. This method can suppress the bending and edge crack defects and significantly improve the shape quality and forming ability. At the same time, through the study of the interface structure of the composite plate, it can be known that the metallurgical bonding can be achieved with a small reduction after adding the hard plate. Two clear layers of Al3Mg2 and Al17Mg12 intermetallic compounds appear at the Al/Mg interface. The thickness of the diffusion layer is significantly larger than that of the traditional hot-rolled clad plate, and the thickness of the diffusion layer can reach 38 μm when the reduction is 60%. The yield strength is 172.3 MPa and the elongation is 21.5%. To sum up, the hot rolling of hard-plate provides a new idea for the forming and manufacturing of high performance heterogeneous composite plate.
Highlights
Light weighting is one of the ideal first-choice ways to achieve energy saving, emission reduction and cost reduction and efficiency enhancement
In addition to adding hard plates above and below the aluminum/magnesium/aluminum (Al/Mg/Al) composite slab, the research results of the hot rolling process of the composite plate with or without the hard plates at 40%, 60%, and 80% reduction show that the hard plates can be rolled During the manufacturing process, the shear stress in the rolling direction (RD) is partially converted into the compressive stress in the normal direction (ND), which increases the welding pressure between the heterogeneous composite laminates, which can inhibit the occurrence of bending and edge cracks, and significantly improve the quality and shape of the board ability
The results showed that the "metallurgical bonding" of the explosive welding interface was achieved by local diffusion, and the diffusion layer was about 3.5μm, The combined interface becomes wavy; Zhang et al [14] prepared Al/Mg/Al composites by hot rolling
Summary
Light weighting is one of the ideal first-choice ways to achieve energy saving, emission reduction and cost reduction and efficiency enhancement. The results showed that the "metallurgical bonding" of the explosive welding interface was achieved by local diffusion, and the diffusion layer was about 3.5μm, The combined interface becomes wavy; Zhang et al [14] prepared Al/Mg/Al composites by hot rolling. Existing research results show that applying hard-plate to rolling magnesium alloy sheet can increase the reduction of a single pass and make the sheet form a bimodal grain structure after rolling [18], which promotes the increase of elongation. For this reason, this paper uses the composite plate rolling process (HPR) with the addition of the hard-plate. Due to the change of the stress state, the ability and quality of the composite connection of heterogeneous materials have an important influence
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