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Nitrogen Interstitial Alloying of CoCrFeMnNi High Entropy Alloy through Reactive Powder Milling

1
Institute of Materials Science and Engineering, NETME Centre, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
2
Institute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
*
Author to whom correspondence should be addressed.
Entropy 2019, 21(4), 363; https://doi.org/10.3390/e21040363
Received: 7 March 2019 / Revised: 30 March 2019 / Accepted: 3 April 2019 / Published: 4 April 2019
The present work is focused on the synthesis of CoCrFeMnNi high entropy alloy (HEA) interstitially alloyed with nitrogen via powder metallurgy routes. Using a simple method, nitrogen was introduced to the HEA from the protective N2 gas atmosphere during mechanical alloying (MA) processing. The lattice parameter and amount of nitrogen in HEA were observed to be linearly proportional to the milling duration. The limited solubility of nitrogen in the main face centered cubic (FCC) phase resulted in the in-situ formation of nitrides and, accordingly, significant increase in the hardness values. It has been shown that fabrication of such nitrogen-doped HEA bulk materials can be conveniently achieved by a simple combination of MA + spark plasma sintering processes, without the need for adding nitrogen from other sources. View Full-Text
Keywords: metallurgy; interstitial; microstructure; powder technology; multi-principal element alloys metallurgy; interstitial; microstructure; powder technology; multi-principal element alloys
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Moravcik, I.; Cizek, J.; Gouvea, L.A.; Cupera, J.; Guban, I.; Dlouhy, I. Nitrogen Interstitial Alloying of CoCrFeMnNi High Entropy Alloy through Reactive Powder Milling. Entropy 2019, 21, 363.

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