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首页> 外文期刊>DVS-Berichte >Development of novel nickel-based brazing alloys, utilising alternative melting point depressants and high entropy alloy concepts
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Development of novel nickel-based brazing alloys, utilising alternative melting point depressants and high entropy alloy concepts

机译：开发新型镍基钎焊合金，利用替代熔点抑制剂和高熵合金概念

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摘要

Nickel-based brazing filler metals combine excellent mechanical properties and corrosion resistance with high melting temperatures, and so they commonly see application in the manufacture and repair of nickel superalloy components. In such brazing alloys, melting point depressants (MPDs) such as boron and silicon are often added, reducing the liquidus temperature to the required level. However, the addition of these elements can result in the formation of undesirable brittle intermetallic phases, which can be detrimental to the mechanical properties of the joint. The present work forms part of an ongoing alloy design project, with two broad aims: the development of novel reducedboron nickel-based brazing alloys, and evaluation of the ability to accurately predict thermodynamic properties of such alloys. Thermo-Calc, which uses the semi-empirical CALPHAD (CALculation of PHAse Diagrams) method, was employed to identify and explore potential novel compositions; the approach utilised alternative MPDs, and concepts such as High Entropy Alloys (HEAs), a new class of multi-principal component materials. Promising alloy compositions, both nickel-based and high entropy alloy-like, were fabricated via arc-melting and used to braze nickel superalloy Inconel-718, with microstructural and mechanical characterisation. Comparisons between the Thermo- Calc predictions of the phases formed in such systems and the experimental observations are discussed.
机译：基于镍的钎焊填料金属结合了优异的机械性能和高熔点温度的耐腐蚀性，因此它们通常可以参见镍超合金组分的制造和修复中的应用。在这种钎焊合金中，通常添加熔点抑制剂（MPD），例如硼和硅，将液体温度降低到所需的水平。然而，添加这些元素可以导致不希望的脆性金属间相的形成，这可能对关节的机械性能有害。目前的工作形成了持续合金设计项目的一部分，具有两种广泛的目的：新型STEXBORON镍基钎焊合金的发展，以及评估准确预测这种合金热力学性质的能力。采用半经验鱿鱼（相图）方法的热钙，用于识别和探索潜在的新型组成;该方法利用替代MPD，以及诸如高熵合金（HEAS）的概念，是一类新的多主成分材料。有前途的合金组合物，镍基和高熵合金样品通过电弧熔化制造并用于钎焊镍超合金Inconel-718，具有微观结构和机械表征。讨论了这种系统中形成的阶段的热钙预测与实验观察之间的比较。

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