Heng Shao , Haiyan Chen , Peng Wang , Shuai Zhao , Zhaoyi Pan , Yongsheng Liu , Xiaoguo Song , Pengcheng Wang , Weimin Long , Wenya Li
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引用次数: 0
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.
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.
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