Abstract No.:
7176

 Scheduled at:
Wednesday, June 22, 2022, Saal Brüssel 11:20 AM
Industrial application of brazing and diffusion bonding


 Title:
Characterisation and performance of a novel high entropy alloy as a braze filler metal for vacuum brazing

 Authors:
Nicholas Ludford* / TWI Ltd., Great Britain
James Redman / TWI Ltd, United Kingdom
Dan Luo/ University of Sheffield, United Kingdom
Russell Goodall/ University of Sheffield, United Kingdom

 Abstract:
The field of High Entropy Alloys (HEAs) offers the possibility to develop tailored alloy compositions for a range of different applications, including as braze filler metals (BFMs). Potential advantages include the ability to avoid the formation of intermetallic phases and tailoring gap filling properties. However, there is limited knowledge of how HEAs perform as a BFM during vacuum brazing which is critical in understanding their applicability for industrial use.
In this work we present the results of wetting and vacuum brazing trials using several different, high temperature HEA compositions on Alloy 718 substrates, selected with a potential industrial application in mind. The HEA compositions were all NiFeCr based, with each distinct HEA having different proportions of these, as well as containing other elements such as Ga, Ge and B. The wettability, microstructure and mechanical properties of the resultant joints were investigated and compared against a wide range of commercially available BFMs (both nickel based and iron based). The Ni-based BFMs were selected to include a range of different melting point depressant elements (e.g. B and Si).


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