Brazing is a crucial joining technology in industries where nickel-superalloy components must be joined. Nickel-based brazing filler metals are extensively employed, possessing excellent mechanical properties, corrosion resistance, and retained strength at elevated temperatures. To function as a filler metal, the alloy melting point must be reduced to below that of the materials being joined, but the addition of melting point depressants (MPDs) such as boron, silicon, and phosphorus can, however, lead to the formation of brittle intermetallics, potentially compromising the joint performance. In the present work, a novel multi-principal element brazing alloy (in the style of a high entropy alloy), utilizing Ge as an alternative MPD along with a reduced B addition, is investigated. The design process considered binary phase diagrams and predictions based on Thermo-Calc software and empirical thermodynamic parameters. The alloy was used to vacuum braze nickel-superalloy Inconel-718, and microstructural and mechanical investigations are reported. The maximum shear strength achieved was 297 MPa with a brazing temperature of 1100 °C and 60-minute hold time, with isothermal solidification completed. Shear strength was only slightly reduced with increased joint width. Assessments are made of the ability to accurately predict properties of multi-principle element alloys using Thermo-Calc software and empirical thermodynamic parameters.

在必须连接镍超合金部件的行业中，钎焊是一项至关重要的连接技术。镍基钎料被广泛使用，具有优异的机械性能，耐腐蚀性和在高温下的保持强度。要用作填充金属，必须将合金的熔点降低到低于所连接材料的熔点，但是添加诸如硼，硅和磷之类的熔点降低剂（MPD）可能会导致合金的形成。易碎的金属间化合物，可能会损害接头性能。在本工作中，研究了一种新型的多主元素钎焊合金（以高熵合金的形式），它利用Ge作为替代MPD并减少了B的添加。设计过程考虑了基于Thermo-Calc软件和经验热力学参数的二元相图和预测。该合金被用于镍-镍合金-Inconel-718的真空钎焊，并进行了显微组织和力学研究。在1100°C的钎焊温度和60分钟的保持时间下，获得的最大剪切强度为297 MPa，并完成了等温固化。剪切强度仅随着接头宽度的增加而略有降低。评估了使用Thermo-Calc软件和经验热力学参数准确预测多原理元素合金性能的能力。在1100°C的钎焊温度和60分钟的保持时间下，获得的最大剪切强度为297 MPa，并完成了等温固化。剪切强度仅随着接缝宽度的增加而略有降低。评估了使用Thermo-Calc软件和经验热力学参数准确预测多原理元素合金性能的能力。在1100°C的钎焊温度和60分钟的保持时间下，获得的最大剪切强度为297 MPa，并完成了等温固化。剪切强度仅随着接缝宽度的增加而略有降低。评估了使用Thermo-Calc软件和经验热力学参数准确预测多原理元素合金性能的能力。