钛/铝/镁爆炸焊复合板波形界面及力学性能

Wavy interface and mechanical properties of explosive welded Ti/Al/Mg cladded plate

关键词:  钛/铝/镁爆炸焊复合板  波形界面  力学性能

Key words:  Ti/Al/Mg explosion cladded plate  bonding interface  mechanical properties

摘要:

文中提出以薄的铝合金板作为过渡层，采用爆炸焊接技术成功制备钛/铝/镁层状复合材料. 对钛/铝接合界面、铝/镁接合界面及钛/铝/镁爆炸复合板的整体力学性能进行了分析研究. OM和SEM试验结果表明，钛/铝接合界面和铝/镁接合界面均为波状接合界面，在铝/镁界面出现了局部熔化区；钛/铝接合界面为小尺寸波(λ=160 μm，h=26 μm)，铝/镁接合界面为大尺寸波(λ=1 740 μm，h=406 μm)；拉-剪试验表明，复合板沿着铝/镁接合界面断裂；弯曲性能测试表明,钛板一侧受拉时复合板弯曲强度和塑性均优于镁合金板一侧受拉，断裂始于铝/镁接合界面，最终从镁合金板一侧剪切断裂失效.

Abstract:

In this study, within the transition layer of aluminum plate, Ti/Al/Mg explosion cladded plate were well fabricated by explosive welding. The Ti/Al, Al/Mg bonding interface and the whole Ti/Al/Mg composite plate’s mechanical properties were investigated. The OM and SEM result revealed that both bonding interface of Ti/Al and Al/Mg interface show periodic wave morphology, and partial melting zone was appeared in the Al/Mg bonding interface. The interface wave sizes of Ti/Al interface wave show a small size with 160 μm in amplitude and 26 μm in wavelength, and the Al/Mg interface wave presents a large size, measured the length of 1 740 μm and the mean amplitude of 406 μm. The fracture position after tensile shear testing test was along Al/Mg bonding interface. The three point bending testing strength of Ti/Al/Mg composite plate was found to be higher under the condition of Mg alloy layer in pressure, and the crack propagation begins at the Al/Mg bonding interface and then fracture failure at the base metal magnesium alloy plate.