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| Abstract No.: |
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Scheduled at:
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Tuesday, May 21, 2019, Saal Brüssel 10:20 AM
High-entropy alloys
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| Title: |
Brazing of high temperature materials using melting range optimized filler metals based on the high-entropy alloy CoCrCuFeNi
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| Authors: |
Tim Ulitzka* / Dortmund University of Technology, Germany
Wolfgang Tillmann / Technische Universität Dortmund, DE
Lukas Wojarski/ Technische Universität Dortmund, DE
M. Manka/ Technische Universität Dortmund, DE
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| Abstract: |
Recently, high-entropy alloys have gained a lot of attention as a potential construction material. Due to their excellent mechanical properties at elevated temperatures, as well as their distinct chemical resistance against oxidation and corrosion, high-entropy alloys are especially suitable for high-temperature material brazing applications. In order to pursue this concept, the high-temperature material molybdenum (99,99 %) and the nickel-base super-alloy 247 were brazed in a vacuum furnace process, using the two-phase, fcc random solid solution high-entropy alloy CoCrCuFeNi as a filler metal. For this paper, shear tests and microstructure analyses of the brazed joints were conducted. Taking the high entropy effect into consideration, high entropy alloys tend to promote a random solid solution with a higher probability than phases with a higher degree of order. Within this context, a special focus was laid on the microstructure and phase development of the high-entropy filler metal, especially due to thermally activated diffusion processes within the joining partners.
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