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 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub 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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引用次数: 0

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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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.