Interfacial strengthening mechanism of C/C/Nb0.74CoCrFeNi2/Nb brazed joints: Stress-relieving effects of the FCC phase

被引：26

作者：

Hu, Jixu ^{[1
]}

Lin, Danyang ^{[1
]}

Li, Xingyi ^{[1
]}

Li, Haolong ^{[1
]}

Li, Jianguo ^{[2
]}

Tang, Zhengxin ^{[3
]}

Xi, Xin ^{[1
]}

Song, Xiaoguo ^{[1
,4
]}

Fu, Wei ^{[1
]}

机构：

[1] Harbin Inst Technol Weihai, State Key Lab Adv Welding & Joining, Weihai 264209, Peoples R China

[2] Inner Mongolia First Machinery Grp Co Ltd, Baotou 014010, Peoples R China

[3] Cent Iron & Steel Res Inst, Res Inst Special Steel, Beijing 100081, Peoples R China

[4] Shandong Inst Shipbuilding Technol, Weihai 264209, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 854卷

基金：

中国国家自然科学基金;

关键词：

Eutectic high-entropy alloy; Brazing; Lattice mismatch; Shear strength; HIGH-ENTROPY ALLOYS; CARBON-CARBON COMPOSITES; C/C COMPOSITES; MICROSTRUCTURE; DESIGN; DUCTILITY; STRATEGY; MO;

D O I：

10.1016/j.msea.2022.143895

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Joining ceramics and metals has long been a key issue for manufacturing structures that are resistant to high temperature. This study joined a carbon-fiber-reinforced carbon-matrix (C/C) composite and Nb using a Nb0.74CoCrFeNi2 eutectic high-entropy alloy filler, and the evolution mechanism of the microstructure and mechanical properties of the joints were systematically studied. The eutectic structure composed of face-centered cubic (FCC) and Laves phases gradually disappeared with the increasing temperature, while the Nb(s,s) layer thickness increased gradually. The lattice mismatch was similar to 97% and similar to 2.8% at the Cr23C6/C/C and FCC/C/C interfaces, respectively. Considering differences in the coefficient of thermal expansion and lattice mismatch, an increase in FCC phase content at the C/C interface is conducive to reinforcing the joint strength. At 1260 degrees C, the combined effects of the highly deformable FCC phase and high-strength Cr23C6 increased the strength of the mixing zone, causing fracture to occur in the Nb(s,s) layer. These results are expected to contribute to further improving the joining of dissimilar materials.

引用

页数：9

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