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Journal of Materials Engineering and Performance

Published in:

21-05-2020

Microstructure and Interfacial Evolution of Sintered NdFeB Permanent Magnet/Steel Joint Soldered with Zn-Sn Alloy

Authors: Cui Luo, Xiaoming Qiu, Yuxin Xu, Yuzhen Lu, Fei Xing

Published in: Journal of Materials Engineering and Performance | Issue 5/2020

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Abstract

Sintered NdFeB permanent magnets and steel were soldered successfully using Zn-Sn alloy. The effects of Sn content on the microstructure and mechanical properties of soldered joints were investigated. The results showed that the typical interfacial microstructure represented NdFeB/NdFe_5.5Zn(B) + ξ-FeZn₁₃/Zn + β-Sn/ξ-FeZn₁₃ + δ-FeZn₁₀ + Γ-Fe₃Zn₁₀/steel. With the addition of Sn, the thickness of the NdFe_5.5Zn(B) phase increased, while more β-Sn was observed in the soldering seam. The maximum shear strength reached 45.3 MPa with a Sn proportion of 6 wt.%, and excessive growth of the NdFe_5.5Zn(B) phase in the joints deteriorated the mechanical properties. The fracture morphology exhibited a ductile-to-brittle transition with the occurrence of interfacial fractures due to thick intermetallic compounds.

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Title: Microstructure and Interfacial Evolution of Sintered NdFeB Permanent Magnet/Steel Joint Soldered with Zn-Sn Alloy
Authors: Cui Luo
Xiaoming Qiu
Yuxin Xu
Yuzhen Lu
Fei Xing
Publication date: 21-05-2020
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 5/2020
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-020-04854-2

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