对Al-Mg-Mn-Zr-Er合金进行TIG焊接,研究了母材和焊缝的微观组织特征,重点研究了Er在焊缝中的存在形式及其对焊缝微观组织的影响.结果表明:Er在焊缝中以Al3Er相的形式存在,其中初生Al3Er具有细化晶粒的作用,次生Al3Er具有弥散强化的作用;在熔合线附近出现由细小等轴晶组成的细晶区,该区域的出现与Er元素的添加有关.
Samples of Al-Mg-Mn-Zr-Er alloys were welded by the method of TIG welding.Microstructures of base metal and welded zones were analyzed by optical microscopy (OM),electron probe micro-analyzer (EPMA) and transmission electron microscopy (TEM).Particular emphasis was laid on the existence form of Er and its effect on the microstructure and the phase composition of the fusion zone.Results reveal that the trace rare earth element Er mainly exists in the form of primary and secondary Al3Er phase,which play significant roles of refining and strengthening the fusion zone.A characteristic Equiaxed Zone (EQZ) is obtained beside the fusion boundary between the partially melted zone and the fusion zone (FZ) due to the addition of Er.
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