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镁合金AZ31B和纯钛TA2通过爆炸焊接的方法成功实现了连接。采用光学显微镜(OM)、扫描电镜(SEM)、以及能谱(EDS)等测试手段对结合界面的微区结构、元素分布进行了分析。研究了在不同温度热处理后AZ31B和TA2界面之间元素的扩散情况。同时结合显微硬度实验、冲击试验、拉伸试验研究了复合板的力学性能。并对复合板的结合机制进行了一定的探讨。结果表明:平直和波浪状结合形貌并存于结合界面。在热处理温度为450和490℃、保温时间为4和8 h时,界面元素扩散明显。由于两侧金属发生塑性变形导致界面硬度升高。复合板的各种力学性能均较基板AZ31B镁合金得到了一定程度的提高。
Magnesium alloy AZ31B and pure titanium TA2 by explosive welding method successfully connected. The microstructure and elemental distribution of the interface were analyzed by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The diffusion of the elements between the AZ31B and TA2 interfaces after heat treatment at different temperatures was investigated. At the same time, combined with the microhardness test, impact test and tensile test, the mechanical properties of the composite board were studied. And the bonding mechanism of the composite board has been discussed. The results show that the flat and wavy bonding morphology coexist in the bonding interface. In the heat treatment temperature of 450 and 490 ℃, holding time of 4 and 8 h, the interface element diffusion obvious. Due to plastic deformation of the metal on both sides lead to the interface hardness. All kinds of mechanical properties of the composite board than the substrate AZ31B magnesium alloy has been improved to some extent.