Abstract：The CrFeCoNiTi0.2 high-entropy alloy was prepared by powder metallurgy and was annealed at 450, 650 and 850 ℃. X-ray diffraction analysis, scanning electron microscopy, energy spectrum analysis, dynamic potential polarization curves and micro Vickers hardness test were conducted to study the effect of annealing treatment on microstructure and properties of powder metallurgy CrFeCoNiTi0.2 high entropy alloy. The results show that the sintered CrFeCoNiTi0.2 high-entropy alloy has FCC as the main phase and Laves phase as the secondary phase. After annealing, the crystallinity of the FCC phase increases, with the presence of new phases (HCP phase, R phase, σ phase). The self-corrosion potential Ecorr and the vickers hardness of the alloy both increase, and the higher the annealing temperature, the better the corrosion resistance and the higher the hardness. After annealing at 850 ℃, the vickers hardness (HV) of the alloy increases from 184 to 356.6.
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2019, Vol. 24 
