采用电场激活固相连接工艺(FADB)实现了AZ31B镁合金与铝粉的固相扩散,观察研究了界面处扩散溶解层的微观形貌和相组成以及界面处元素交互扩散分布情况,测试了扩散溶解层的表面硬度和耐腐蚀性,探讨电场对AZ31B/Al固相扩散的影响.研究结果表明,在FADB条件下,AZ31B/Al结合界面处形成的扩散溶解层由均匀共晶层-溶解过渡层和胞晶区构成;外加电场通过降低界面处生成物的激活能,促进了Mg-Al间的扩散反应,所形成的锯齿状结构有利于提高界面连接强度;试样表面的平均硬度及耐腐蚀性能均高于镁合金母材.
Aluminum powder and magnesium AZ31B were bonded by field-active diffusion bonding process (FADB). Microstructure and phase composition of the diffusion dissolution layer were determined, and the elements profile across the interface were detected, the microhardness and corrosion resistance of the surface were evaluated, and the effect of the electric field on the bonding was discussed. The results show that the diffusion dissolution layer in the interface is composed of eutectic layer, transition layer and cellular crystal layer. The electric field promotes the diffusion of Mg and Al elements by reducing the activation energy of intermetallic compound formation. The zigzag structure of the diffusion dissolution layer is beneficial to the bonding strength improvement of AZ31B/Al. The surface has better properties including hardness and corrosion resistance than that of AZ31B.
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