The novel high-entropy alloy filler realized the efficient inhibition of the violent reaction and brittle phase formation in the SiCf/SiC heterogeneous brazed joint

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-04-01 Epub Date: 2025-02-15 DOI:10.1016/j.matchar.2025.114849

Yu Zhang , Wei Guo , Han Mei , Xiang Kong , Ying Zhu , Xiaoguang Li , Wei Zhao , Hongqiang Zhang

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Abstract

Based on the significant needs of the high thrust-to-weight ratio aero engines, the new SiC_f/SiC composites and superalloy brazed joints in the hot-end components was proposed, aiming to the controllability and considerable residual stress of SiC_f/SiC heterogeneous joints. The self-developed high-entropy alloy (HEA) AlTiCoCrCu filler was used to realize the homogeneous brazing of SiC_f/SiC, and then upgraded to AlTiCoCrCuRe filler to discover the high-performance of SiC_f/SiC heterogeneous joints. The microstructure regulation of heterogeneous brazed joints was studied, and the brittle phases decreased sharply without defects after upgrading HEA filler. Adding a small amount of Re effectively inhibited the violent diffusion of asymmetric interfacial elements and significantly reduced Ni₂Si brittle phases, the source of harm to tissue properties. The microstructure and phase composition of the brazed joint were clarified, and the strengthening mechanism of the upgraded components of HEA filler on the microstructure and the regulation mechanism of solidification at the heterogeneous interface were revealed. The joint shear strength was significantly better than that of traditional commercial filler, and the filler upgrade improved the “structure-performance” synergy. The research results provided a unique high-temperature HEA filler and theoretical basis for the shape-performance control of SiC_f/SiC composites brazing of aero engines.

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新型高熵合金钎料能有效抑制SiCf/SiC非均相钎焊接头的剧烈反应和脆性相的形成

基于高推重比航空发动机的迫切需求，针对SiCf/SiC非均质接头的可控性和可观的残余应力，提出了新型SiCf/SiC复合材料和高温合金钎焊接头用于热端部件。采用自行研制的高熵合金（HEA） AlTiCoCrCu钎料实现SiCf/SiC的均匀钎焊，再升级为AlTiCoCrCuRe钎料，发现SiCf/SiC非均质接头的高性能。研究了非均相钎焊接头的微观组织规律，改进HEA钎料后，钎焊接头的脆性相明显减少，且无缺陷。少量稀土的加入有效抑制了不对称界面元素的剧烈扩散，显著降低了Ni2Si脆性相的含量，这是影响组织性能的根源。澄清了钎焊接头的显微组织和相组成，揭示了HEA填料升级组分对钎焊接头显微组织的强化机理和非均质界面处的凝固调节机理。节理抗剪强度明显优于传统工业填料，填料升级提高了“结构-性能”协同效应。研究结果为航空发动机SiCf/SiC复合材料钎焊成形性能控制提供了一种独特的高温HEA填料和理论依据。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.