This paper presents the results of investigations on wetting with Pd-Ni-Cr(Me)-Ge system brazing filler metal of pure nickel, high-temperature alloy based on nickel aluminide (Ni₃Al). Micro-X-ray spectrum examinations showed that spread of Pd-Ni-Cr(Ме)-Ge system brazing filler metal over pure nickel substrate, which has no aluminum, promoted crystallization of brazing filler metal in the form of a solid solution of palladium-nickel and single disperse inclusions of (PdNiCr)-14,13Ge phase. This inclusion precipitates along the boundaries of solid solution grains and can be the reason for strengthening phase. In the spread of this alloy over Ni₃Al (Ni-Al-Mo-В)-based high-temperature alloy, containing around 10 wt.% of aluminum, there is another composition and morphological structure of brazing filler metal after crystallization. Thus, the solid solution crystallizes on the base metal substrate. Phase precipitations based on palladium (60.59%) saturated with aluminum (12.3%) is formed in it. In brazing of Ni₃Al (Ni-10Al-14Mo-В)-based alloy using this brazing filler metal, the high concentration of aluminum in base metal and the presence of concentration gradient at interface result in active diffusion of the latter from base metal in the brazed seam. Diffusion processes lead to the substitution of germanium on aluminum in (PdNiCr)_xGe_y phase. It results in the formation of (PdNiCr)_xAl_y intermetallic phase, the concentration of aluminum which corresponds to the concentration of aluminum in base metal and it precipitates in a central zone of the brazed seam and leads to brittle fracture of the brazed joints. The use of the brazing filler metal on the Ni-Cr-Al-Me for brazing of nickel aluminide leads to the formation of a structure without intermetallic phases and eutectics in the central zone of the brazed seam.

中文翻译：

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Ni 3 Al基合金扩散过程对钎焊接头和钎料结构的影响。

本文介绍了用纯铝，基于铝化镍（Ni ₃ Al）的高温合金的Pd-Ni-Cr（Me）-Ge系钎料润湿的研究结果。显微X射线光谱检查表明，Pd-Ni-Cr（Ме）-Ge系钎料在没有铝的纯镍基体上的扩散促进了钯固溶体形式的钎料的结晶-（PdNiCr）-14,13Ge相的镍和单分散夹杂物。该夹杂物沿固溶体晶粒的边界沉淀，并且可能是强化相的原因。该合金在Ni _3上的扩散基于Al（Ni-Al-Mo-В）的高温合金，包含约10 wt。％的铝，结晶后还具有另一种成分和钎焊金属的形态结构。因此，固溶体在贱金属基板上结晶。在其中形成了以铝（12.3％）饱和的钯（60.59％）为基础的相沉淀。在使用这种钎料对Ni ₃ Al（Ni-10Al-14Mo-В）基合金进行钎焊时，母材中铝的高浓度和界面处的浓度梯度会导致后者从母材中有效扩散。在铜焊缝中。扩散过程导致锗在（PdNiCr）_x Ge _y相中取代了铝。导致形成（PdNiCr）_xAl _y金属间相，铝的浓度与贱金属中的铝浓度相对应，并在钎焊缝的中心区域沉淀并导致钎焊接头脆性断裂。在Ni-Cr-Al-Me上使用钎焊金属钎焊铝化镍可导致在钎焊缝的中心区域形成无金属间相和低共熔物的组织。