TiZrCuNi非晶钎料高温钎焊Ti60/Ti<sub>2</sub>AlNb接头界面组织及其力学性能强化机制

敖广阔

doi:10.7512/j.issn.1001-2303.2026.07.13

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TiZrCuNi非晶钎料高温钎焊Ti60/Ti₂AlNb接头界面组织及其力学性能强化机制
Interfacial Microstructure and Mechanical Strengthening Mechanism of Ti60/Ti₂AlNb Joints High-temperature Brazed with TiZrCuNi Amorphous Filler
2026年56卷第7期页码：99-105
收稿：2026-01-23，

修回：2026-03-26，

纸质出版：2026-07-20
DOI： 10.7512/j.issn.1001-2303.2026.07.13
稿件说明：

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敖广阔.TiZrCuNi非晶钎料高温钎焊Ti60/Ti₂AlNb接头界面组织及其力学性能强化机制［J］.电焊机，2026，56（7）：99-105. DOI: 10.7512/j.issn.1001-2303.2026.07.13. DOI：

AO Guangkuo.Interfacial Microstructure and Mechanical Strengthening Mechanism of Ti60/Ti₂AlNb Joints High-temperature Brazed with TiZrCuNi Amorphous Filler［J］.Electric Welding Machine， 2026， 56（7）： 99-105. DOI: 10.7512/j.issn.1001-2303.2026.07.13. DOI：

摘要

针对航空发动机用Ti60和Ti

AlNb高温钛合金的异质连接需求，采用TiZrCuNi非晶钎料在990~1 080 °C高温区间开展真空钎焊试验，借助SEM、EDS和XRD等手段对不同温度下接头界面的微观组织特征与物相组成进行了系统表征，测试了接头的室温剪切强度，并结合断口形貌分析揭示了接头的失效机制。结果表明，随着钎焊温度的升高，钎缝中心脆性化合物由连续富集态逐步向弥散分布态转变，界面组织均匀性持续改善；在1 050 ℃条件下接头获得最大剪切强度319.7 MPa；继续升温至1 080 ℃时，母材侧出现明显组织粗化现象，接头承载能力随之回落。断裂行为分析揭示了温度升高对接头

失效模式的调控作用。研究表明，合理调控钎焊温度可有效平衡界面反应程度与母材组织稳定性，为高温钛合金构件的高质量钎焊连接提供了可行方案。

Abstract

This study addresses the reliability challenges in joining critical high-temperature titanium alloy components (Ti60 and Ti

AlNb) used in aero-engines and other high-end equipment. Vacuum brazing experiments were conducted using a TiZrCuNi amorphous filler metal within a high-temperature range of 990-1 080 ℃

systematically investigating the effect of brazing temperature on the evolution of interfacial microstructure and the strengthening mechanisms of mechanical properties in the joints. The interfacial microstructure was characterized by scanning electron microscopy (SEM)

energy dispersive spectroscopy (EDS)

and X-ray diffraction (XRD)

while the room-temperature shear strength of the joints was tested. The results indicate that brazing temperature is a critical factor regulating the interfacial structure and performance: at lower temperatures (990-1 020 ℃)

a continuously distributed brittle intermetallic compound (IMC)-rich band easily forms in the brazing seam center

consisting mainly of Ti

and Zr

Ni. These compounds induce microcracks during cooling

leading to quasi-cleavage fracture and relatively low joint strength. At the optimized temperature of 1 050 ℃

sufficient elemental diffusion significantly reduces and disperses the brittle phases

resulting in a uniform microstructure dominated by solid solutions and eutectoid structures in the interface. The joint achieved the highest shear strength of 319.7 MPa. However

when the temperature increased to 1 080 ℃

grain coarsening and the formation of coarse needle-like Widmanst?tten structure occurred on the Ti60 base metal side

acting as stress concentration sources and causing a decrease in strength. Fractography further revealed that the fracture morphology transitioned from IMCs to α+β phases as the brazing temperature increased. This stud

y demonstrates that high-temperature brazing effectively suppresses the enrichment of brittle phases

providing new theoretical insights and a process solution for achieving high-strength and high-reliability joining of high-temperature titanium alloy components.

关键词

Keywords

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