University of Oulu

Yang, Y., Wang, G., He, R., Shu, D., Tan, C. and Cao, W. (2021), Microstructure and mechanical properties of ZrB2‐SiC/Nb joints brazed with CoFeNiCrCuTix high‐entropy alloy filler. J. Am. Ceram. Soc., 104: 2992-3003. https://doi.org/10.1111/jace.17732

Microstructure and mechanical properties of ZrB₂‐SiC/Nb joints brazed with CoFeNiCrCuTiₓ high‐entropy alloy filler

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Author: Yang, Yunlong1; Wang, Gang1; He, Rujie2;
Organizations: 1Anhui Key Laboratory of High-performance Non-ferrous Metal Materials, Anhui Polytechnic University, Wuhu 241000, PR China
2Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China
3State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China
4Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014, Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2021051429897
Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2022-02-15
Description:

Abstract

ZrB₂‐SiC ceramics and Nb alloy were brazed at 1160°C for 60 min with CoFeNiCrCuTix high‐entropy alloy filler. The influence of Ti content on the interface structure and mechanical properties of ZrB₂‐SiC/Nb joint was systematically studied. It is found that the rich‐Ti Laves phase was formed due to the addition of large atomic size Ti fill into the filler alloy or brazing joint, and its content increases with Ti content. The joint brazed by high‐entropy alloys filler without Ti can be divided into a tooth‐shaped Cr₂B reaction layer and a central area composed of a eutectic mixed structure of FCC phase and rich‐Nb lamellar Laves phase. Ti and Nb are mutual solid solution elements. The increase of Ti content in the joint makes the FCC phase and the rich‐Nb lamellar Laves phase to transform into a big bulk Ti‐rich Laves phase and the quadrilateral (Ti, Nb)B phase. The tooth‐shaped Cr₂B was disappeared. The residual stress generated in the joint during the brazing process tends to cause defects such as holes and microcracks in the bulk Ti‐rich brittle Laves phase. Therefore, with the addition of Ti, the normal temperature performance of the joint decreases from 216 MPa to 52 MPa. However, with the increase of Ti, the high‐temperature mechanical properties of the joint first decrease, and then increase. It was mainly due to the formation of rich‐Ti Laves phase and quadrilateral (Ti, Nb)B with excellent high‐temperature mechanical properties. When brazing with CoFeNiCrCuTi1.5 filler, the high‐temperature performance of the joint reached 92% of its room temperature performance.

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Series: Journal of the American ceramic society
ISSN: 0002-7820
ISSN-E: 1551-2916
ISSN-L: 0002-7820
Volume: 104
Issue: 7
Pages: 2992 - 3003
DOI: 10.1111/jace.17732
OADOI: https://oadoi.org/10.1111/jace.17732
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
114 Physical sciences
Subjects:
Funding: This work was financially supported by the Natural Science Foundation of Anhui Province (2008085J23), National Natural Science Foundation of China (51704001); Talent Project of Anhui Province (Z175050020001); Anhui Provincial Grant for high‐level platform construction, and the Academy of Finland (No. 311934).
Academy of Finland Grant Number: 311934
Detailed Information: 311934 (Academy of Finland Funding decision)
Copyright information: © 2021 The American Ceramic Society. This is the peer reviewed version of the following article: Yang, Y., Wang, G., He, R., Shu, D., Tan, C. and Cao, W. (2021), Microstructure and mechanical properties of ZrB2‐SiC/Nb joints brazed with CoFeNiCrCuTix high‐entropy alloy filler. J. Am. Ceram. Soc., 104: 2992-3003, which has been published in final form at https://doi.org/10.1111/jace.17732. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.