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%.
Highlights
With an increasing demand of particularity and multifunctionality of materials, the hybrid materials which could achieve the combination of merits of two or more materials have been paid wide attention[1]
In order to widen the application of magnesium alloys, it is necessary to fabricate the composites by cladding magnesium alloys with other alloys which possess good formability and corrosion resistance
Aluminum (AA6061)/magnesium (AZ31B)/ aluminum (AA6061) composite plates were fabricated by explosive welding (EXW) in one stage
Summary
With an increasing demand of particularity and multifunctionality of materials, the hybrid materials which could achieve the combination of merits of two or more materials have been paid wide attention[1]. In order to widen the application of magnesium alloys, it is necessary to fabricate the composites by cladding magnesium alloys with other alloys which possess good formability and corrosion resistance These structures enable combinations of selective properties such as good formability, high strength and good corrosion from the constituent metallic alloys. Comparing with many metallic alloys that can act as cladding materials, like copper[21], titanium[22] and stainless steel[17], lightweight aluminum alloys with good corrosion resistance have been widely taken into consideration[23,24] In this regard, the EXW process could fabricate Al/Mg composites with the advantage of combination of corrosion-resistance and high specific strength. Annealing was performed to achieve good combination of interface microstructures and mechanical properties of the thin EXWed-rolled composites
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