Microstructure and wear resistance of CoFeNiCrNb0.5 high entropy alloy cladding layer
In this study,the CoFeNiCrNb0.5 high entropy alloy cladding layer was fabricated on the surface of 316L stainless steel by plasma cladding technology.The microstructure,phase composition,element distribution and wear resistance of the cladding layer of CoFeNiCrNb0.5 high entropy alloy were studied.The results show that the phase composition of the cladding layer of CoFeNiCrNb0.5 high entropy alloy is composed of FCC phase and Laves phase with face-centered cubic structure.Among them,the FCC phase is the matrix phase,and the Laves phase is formed at the interdendrite.The microhardness of the cladding layer of the CoFeNiCrNb0.5 high entropy alloy is about(510.5±14.2)HV,which is about 2.1 times that of the 316L matrix.The higher hardness of the cladding layer is mainly caused by the solid solution strengthening of Nb element and the diffusion strength-ening of Laves phase.In addition,the CoFeNiCrNb0.5 high entropy alloy cladding layer has excellent wear resis-tance,and the specific wear rate is about 5.9×10-6 mm3/N·m,which is significantly better than the stainless steel substrate.Abrasive wear is the main wear mechanism of CoFeNiCrNb0.5 high entropy alloy cladding layer.
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