NDLI: Precipitation Hardening of the HVOF Sprayed Single-Phase High-Entropy Alloy CrFeCoNi

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Precipitation Hardening of the HVOF Sprayed Single-Phase High-Entropy Alloy CrFeCoNi

Content Provider	MDPI
Author	Martin, Löbel Lindner, Thomas Hunger, Ralph Berger, Robin Lampke, Thomas
Copyright Year	2020
Description	The application of high-entropy alloys (HEA) in surface technology has great potential due to the high corrosion and wear resistance. A further improvement can be achieved by applying thermochemical treatments. Powder-pack boriding enables the formation of a protective precipitation layer. This process has already been applied for cast HEAs causing the formation of a diffusion-enriched surface layer and a distinct increase in wear resistance. In the current investigations, the alloy CrFeCoNi with a single-phase face-centred cubic (fcc) structure is considered. An efficient application can be achieved by limiting the material usage of HEAs to the surface. Therefore, the high-velocity-oxygen-fuel (HVOF) thermal spray process is applied. Boriding was conducted with an adapted powder-pack routine. Furthermore, borided bulk HEAs were considered as a reference. The influence of the production route and boriding treatment on the microstructure, phase formation, and properties was investigated in detail. For the coating and the cast HEA, a precipitation layer is formed. Hence, the hardness and wear resistance are significantly increased. The current study proves the suitability of the investigated process combination.
Starting Page	701
e-ISSN	20796412
DOI	10.3390/coatings10070701
Journal	Coatings
Issue Number	7
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-07-20
Access Restriction	Open
Subject Keyword	Coatings Coatings and Films High-entropy Alloy Hea Coating Hvof Boriding Precipitation Phase Formation Microstructure Wear
Content Type	Text
Resource Type	Article

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