Effect of Nb addition on the structure and mechanical behaviors of CoCrCuFeNi high-entropy alloy coatings

The microstructure and mechanical properties of the CoCrCuFeNiNb high-entropy alloy coating prepared by plasma transferred arc cladding process were investigated. Two phases are found in the prepared coating with Nb: one is face-centered-cubic solid solution phase; the other is the Laves phase of (C...

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Bibliographic Details
Published in:Surface & coatings technology 2014-02, Vol.240, p.184-190
Main Authors: Cheng, J.B., Liang, X.B., Xu, B.S.
Format: Article
Language:English
Subjects:
Abrasion resistance
Abrasion resistant coatings
Applied sciences
Austenitic stainless steels
Coatings
Contact of materials. Friction. Wear
Corrosion
Corrosion environments
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Modulus of elasticity
Niobium
Physics
Production techniques
Protective coatings
Sand
Surface treatment
Surface treatments
Wear
Wear resistance
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Summary:The microstructure and mechanical properties of the CoCrCuFeNiNb high-entropy alloy coating prepared by plasma transferred arc cladding process were investigated. Two phases are found in the prepared coating with Nb: one is face-centered-cubic solid solution phase; the other is the Laves phase of (CoCr) Nb type. The nano-indentation testing indicates that the microhardness (H), elastic modulus (E), the hardness/modulus of elasticity ratio (H/E ratio) and high resistance to plastic deformation (H3/E2) of the coating with Nb are 6.13GPa, 221GPa, 0.028 and 4.7×10−3 respectively. The CoCrCuFeNiNb coating displays excellent wear and corrosion resistance. The wear resistance of the coating with Nb is about 1.5 times higher than that of the coating without Nb under the same wet sand rubber wheel abrasion testing conditions. Compared with the coating without Nb and as-cast 304 stainless steel, the coating with Nb shows the lowest icorr values in polarization curves and the highest fitted Rf values in EIS plots in 6N hydrochloric acid solution. •The CoCrCuFeNiNb HEA coating was prepared by PTA cladding process.•The Nb-free coating was also studied as a comparison material.•Nano-indention was used to investigate mechanical properties of the coating.•The coating has better wear and corrosion resistance than that of Nb-free coating.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.12.053