Microstructure and Mechanical Properties of AA6061/AZ31B/AA6061 Composite Plates Fabricated by Vertical Explosive Welding and Subsequent Hot Rolling

Abstract

In this study, three-ply Al/Mg/Al composite plates were successfully achieved by vertical explosive welding (EXW) method. After EXW, the sound joints were obtained. Then thin three-ply Al/Mg/Al EXWed composite plates with the thickness of 1.78 mm were achieved by hot rolling. The influence of annealing on the interface microstructures and mechanical properties of the thin composite plates was investigated. The results indicated that different morphology with big waveform and mini waveform was present in the explosively bonded interface. The interface shear strength was 91MPa for big waveform side and 92Mpa for mini waveform side. The rolled sample without annealing possessed the high ultimate tensile strength (UTS) value of 235Mpa and elongation of 8.5%. The equiaxed and homogeneous grain morphology of magnesium alloys in the thin three-ply Al/Mg/Al composite plates could be induced by annealing 300°C for 1 h. This contributed to the considerable increase of elongation by 18.5%.

Effect of Interface on Mechanical Properties of Ti/Al/Mg/Al/Ti Laminated Composites

“…When the concentration is more than the maximum equilibrium concentration, the Al 3 Mg 2 and Mg 17 Al 12 precipitate from supersaturated solid solution of Al (Mg) and Mg (Al), respectively. The similar results were also confirmed by Yang et al's investigation 5 . During the subsequent reaction process, a large number of intermetallic phases precipitate continuously, which accumulate and form a thin layer along the interface.…”

“…Consequently, an intermediate layer should be added at Ti/Mg interface to facilitate atomic diffusion or reaction. In reality, the in-depth studies had been done on Mg/Al 5 and Ti/Al 6 composites in previous works. Accordingly, it is feasible to fabricate Ti/Al/Mg/Al/Ti laminated composites by using Al as a connection layer between Ti and Mg sheets 7 .…”

“…Currently, solid-solid synthesis has been widely used because of fewer pores, oxidation inclusions and higher bonding strength than traditional fusion techniques. Solid-solid synthesis includes rolling 8 , hot-pressing 9 , explosive welding 10 , extrusion 11,12 and two or more of them (such as explosive welding and rolling 5 , hot-pressing and rolling 13 and so on). For instance, Zhang et al 8 manufactured Al/Cu/Ti/Cu/Al laminated composites via cold-rolling, exploring the fracture mechanism.…”

Microstructure Characteristics and Corrugation Interface Behavior of Al/Mg/Al Composite Plate Rolled Under Large Strain

“…The tensile strength is 235 MPa and the elongation is 13%. In addition, the research results on the properties of rolled composite plates after explosive welding showed that [17,18] secondary rolling could significantly improve the tensile strength of composite plates, but it was still obtained at the expense of plasticity.…”

Effect of Annealing Process on the Microstructures and Mechanical Properties of AZ31B/A356 Composite Plate Fabricated by Cast Rolling

“…On the one hand, the weight of aluminium alloy in the same volume can be reduced, andonthe other hand, the poor corrosion resistance of magnesium alloy will be overcome. The two materials benefit from each other in terms of performance and produce a synergistic effect, which makes the composite plate better than the original material, thus rendering it more able to meet various demands imposed by use in most applications [6][7][8][9][10][11] .…”