Strengthening Effect of Semi-Coherent Interface on TiAl/Ni based SuperAlloy Brazing Joint Prepared by High Entropy Filler

LI Xinyue; FU Mengchun; LIN Panpan; LIN Tiesong; HE Peng

doi:10.7512/j.issn.1001-2303.2025.10.02

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Strengthening Effect of Semi-Coherent Interface on TiAl/Ni based SuperAlloy Brazing Joint Prepared by High Entropy Filler
Vol. 55, Issue 10, Pages: 13-21(2025)
Received：28 August 2025，

Published：20 October 2025
DOI： 10.7512/j.issn.1001-2303.2025.10.02
稿件说明：

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李昕悦，傅孟春，林盼盼，等.高熵钎料制备TiAl/Ni基高温合金接头中半共格界面的强化作用［J］.电焊机，2025，55（10）：13-21. DOI： 10.7512/j.issn.1001-2303.2025.10.02.

LI Xinyue, FU Mengchun, LIN Panpan, et al.Strengthening Effect of Semi-Coherent Interface on TiAl/Ni based SuperAlloy Brazing Joint Prepared by High Entropy Filler[J].Electric Welding Machine, 2025, 55(10): 13-21. DOI： 10.7512/j.issn.1001-2303.2025.10.02.

摘要

采用Ni

FeCr高熵钎料，通过接触反应钎焊实现了TiAl与Ni基高温合金之间的高强度连接。利用合金体系中元素性质的差异，促进了高熵体系的相分离，同时原子半径的匹配有利于在整个接头中广泛形成半共格界面。研究表明，半共格界面通过周期性错配位错及其弹塑性协同调节机制，有效释放了界面残余应力，从而显著提升了接头力学性能：室温剪切强度接近TiAl母材，并在650 °C下仍保持高强度。原子尺度模拟与RDF分析进一步揭示，Ni与Cr-Mo-Fe富集相的热力学分离倾向驱动了半共格界面的自发形成，为焊缝微观结构的稳定性提供了关键机制。本研究阐明了半共格界面在高熵钎焊异种合金接头性能提升中的作用机制，为先进结构材料连接中的微观组织设计提供了新的理论依据。

Abstract

High-strength joining between TiAl and Ni-based superalloy was achieved by reactive brazing using a Ni

FeCr high-entropy filler. The differences in element properties within the high-entropy system promoted phase separation

while atomic radius compatibility facilitated the widespread formation of semi-coherent interfaces across the joint. The results indicate that these semi-coherent interfaces

through periodic misfit dislocations and their elastoplastic cooperative regulation

effectively relieve residual stresses

at the interface

significantly enhancing the mechanical performance of the joint: the room-temperature shear strength approaches that of the TiAl substrate and remains high at 650 °C. Atomic-scale simulations and radial distribution function (RDF) analyses further reveal that the thermodynamic separation tendency between Ni and Cr-Mo-Fe-rich phases drives the spontaneous formation of semi-coherent interfaces

providing a key mechanism for the stability of the weld microstructure. This study elucidates the critical role of semi-coherent interfaces in enhancing the performance of high-entropy brazed dissimilar alloy joints and offers new insights for microstructural design in advanced structural material joining.

关键词

Keywords

references

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