采用钨极氩弧焊方法,使用自行设计制备的NiCuNbCr合金作为焊料,实现Ti3 A1基合金与GH4169高温合金异种材料之间的焊接.采用扫描电镜(SEM)及能谱分析(XEDS)等方法对接头横截面的微观组织进行分析.结果表明:GH4169/焊缝界面以及焊缝均主要由Ni元素的固溶体组成,其中固溶了Cu,Fe,Cr,Nb几种元素;而焊缝/Ti3 Al界面分为3层组织,其相组成从Ti3 Al母材到焊缝方向依次为:固溶了Ni和Cu元素的Ti2 AlNb相、Al(Ni,Cu)2Ti金属间化合物及(Nb,Ti,Mo)固溶体;(Ni,Nb,Cr)及Ni(Cu,Ti)固溶体;Ni的固溶体,固溶元素为Cu,Nb和Cr.接头的平均室温抗拉强度为140.7MPa.拉伸试样断裂于被焊Ti3 Al母材表面的扩散反应层,它主要由固溶了Ni和Cu元素的Ti2 AlNb相与Al(Ni,Cu)2Ti金属间化合物组成,该界面是Ti3 Al/GH4169接头的薄弱环节.
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