Abstract Vacuum diffusion brazing of tungsten based powder alloy and superalloy GH907 was conducted using Cu-25Ni-5V-7.5Ti (wt.%) interlayer. The typical interfacial microstructure and elements diffusion behavior were characterized. Furthermore, the effect of brazing temperature and holding time on microstructure and mechanical properties of joints were also investigated. The results showed that an undulating reaction layer and a diffusion layer with the thickness of 7.2 μm were formed adjacent to the tungsten based powder alloy, indicating good metallurgical bonding. An infiltration zone with a concentration of active elements V, Ti was formed at the superalloy GH907 side. (Cu, Ni) solid solution matrix with great plasticity was observed in the interlayer, in which some Cu4Ti3 and Ni2V phases were distributed. The joints brazed at 1100 °C for 40min exhibited the maximum shear strength of 171.6 MPa at room temperature, and the shear strength of 113.8 MPa was maintained at the test temperature of 400 °C due to the residual V, Ti particles dispersed in (Cu, Ni) solid solution matrix.

中文翻译：

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Cu-Ni-V-Ti夹层钨基粉末合金与高温合金GH907扩散钎焊接头的界面组织和力学性能

摘要 采用Cu-25Ni-5V-7.5Ti (wt.%)夹层对钨基粉末合金和GH907高温合金进行真空扩散钎焊。表征了典型的界面微观结构和元素扩散行为。此外，还研究了钎焊温度和保温时间对接头显微组织和力学性能的影响。结果表明，在钨基粉末合金附近形成了一个起伏的反应层和一个厚度为7.2 μm的扩散层，表明了良好的冶金结合。在高温合金 GH907 侧形成了活性元素 V、Ti 浓度的渗透区。(Cu, Ni) 固溶体基体在夹层中观察到具有很大的塑性，其中分布有一些 Cu4Ti3 和 Ni2V 相。