Enhanced Strength and Toughness of SiCf/SiC joints though Zr-induced Core-Shell Microstructure evolution in high entropy brazing fillers

IF 4.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Heng Shao , Haiyan Chen , Peng Wang , Shuai Zhao , Zhaoyi Pan , Yongsheng Liu , Xiaoguo Song , Pengcheng Wang , Weimin Long , Wenya Li
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Abstract

This study utilizes (FeCoNiCrCu)100-X ZrX (X = 10, 15) high-entropy brazing alloys to enable reliable joining of SiCf/SiC composites to Zr using a vacuum brazing furnace. Microscopic analysis shows that increasing the Zr content to 15 at% significantly improves the wettability of the brazing alloy and promotes the formation of a distinctive “ZrCrFe core–Zr2Cu shell” microstructure. Compared with the ZrCrFe phase, the Zr2Cu phase exhibits enhanced plastic deformation capacity. After encapsulating the brittle ZrCrFe phase, it promotes the formation of a region near the SiCf/SiC interface dominated by plastic FCC phases and Zr2Cu phases. The Zr2Cu phase exhibits a coherent crystallographic orientation with the FCC matrix phase, indicating a relatively low lattice mismatch. The wrapped structure contributes to joint toughening through two primary mechanisms: (1) it prevents direct contact between the brittle ZrCrFe phase and the SiCf/SiC composite, thereby mitigating crack initiation; and (2) it alleviates residual stress concentrations at the ZrCrFe–FCC interface caused by lattice mismatch, enhancing the overall plastic deformation capacity. Finally, the shear strength of the joint containing 15 at% Zr reached 78.61 MPa, representing a 22.4 % increase compared to the specimen containing 10 at% Zr, and indicating enhanced plastic deformation capacity and overall joint strength.
高熵钎料zr诱导核壳组织演化提高SiCf/SiC接头强度和韧性
本研究利用(FeCoNiCrCu)100-X ZrX (X = 10,15)高熵钎焊合金,在真空钎焊炉上实现了SiCf/SiC复合材料与Zr的可靠连接。金相分析表明,将Zr含量提高到15% (at%)时,钎料的润湿性显著提高,并促进了独特的“ZrCrFe芯- zr2cu壳”组织的形成。与ZrCrFe相相比,Zr2Cu相具有更强的塑性变形能力。在包裹脆性ZrCrFe相后,促进SiCf/SiC界面附近形成以塑性FCC相和Zr2Cu相为主的区域。Zr2Cu相表现出与FCC基体相一致的晶体取向,表明晶格失配程度相对较低。包裹结构通过两种主要机制促进接头增韧:(1)防止脆性ZrCrFe相与SiCf/SiC复合材料直接接触,从而减缓裂纹萌生;(2)缓解了ZrCrFe-FCC界面因晶格失配引起的残余应力集中,提高了整体塑性变形能力。最后,添加15 (% Zr)的节理抗剪强度达到78.61 MPa,比添加10 (% Zr)的节理抗剪强度提高22.4%,表明节理塑性变形能力和整体强度得到增强。
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来源期刊
Intermetallics
Intermetallics 工程技术-材料科学:综合
CiteScore
7.80
自引率
9.10%
发文量
291
审稿时长
37 days
期刊介绍: This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.
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