Brazing of CoCrFeNi and CoCrFeMnNi equiatomic alloys using 70Au-8Pd-22Ni filler foil

Brazing of CoCrFeNi and CoCrFeMnNi equiatomic alloys using 70Au-8Pd-22Ni (AuPdNi) filler foil by infrared and traditional furnaces was investigated. The wettability of AuPdNi filler on both CoCrFeNi and CoCrFeMnNi substrates is excellent at 1050 °C. CoCrFeNi/AuPdNi/CoCrFeNi joints brazed using infra...

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Bibliographic Details
Published in:Gold bulletin (World Gold Council) 2020-06, Vol.53 (2), p.101-109
Main Authors: Lin, Chieh, Shiue, Ren-Kae, Wu, Shyi-Kaan, Huang, Jian-Yuan, Huang, Yung-Chien
Format: Article
Language:English
Subjects:
Alloys
Brazed joints
Brazing alloys
Chemistry and Materials Science
Dimpling
Foils
Furnaces
Intermetallic compounds
Materials Science
Metallic Materials
Original Paper
Shear strength
Solid solutions
Solidification
Substrates
Wettability
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Summary:Brazing of CoCrFeNi and CoCrFeMnNi equiatomic alloys using 70Au-8Pd-22Ni (AuPdNi) filler foil by infrared and traditional furnaces was investigated. The wettability of AuPdNi filler on both CoCrFeNi and CoCrFeMnNi substrates is excellent at 1050 °C. CoCrFeNi/AuPdNi/CoCrFeNi joints brazed using infrared and traditional furnaces are composed of Au/Ni-rich solid solutions of different sizes. CoCrFeMnNi/AuPdNi/CoCrFeMnNi joints brazed with an infrared furnace are composed of large globular CoCrFeNi/Ni-rich particles in AuMn intermetallic matrix. In traditional furnace brazed CoCrFeMnNi/AuPdNi/CoCrFeMnNi joints, the AuMn intermetallic compound is uniformly distributed in CoCrFeNi-based and Ni-rich phases. The average shear strengths of both infrared and traditional furnace brazed CoCrFeNi/AuPdNi/CoCrFeNi joints exceed 300 MPa, and all joints fractured at the brazed zone present dimple dominated fracture. In contrast, the traditional furnace brazed CoCrFeMnNi/AuPdNi/CoCrFeMnNi joint has a much lower average shear strength of 173 MPa because of the existence of many solidification shrinkage voids in the brazed zone.
ISSN:2364-821X
2190-7579
DOI:10.1007/s13404-020-00278-x