Effects of Annealing Treatment on Microstructure and Properties of CrNiTiMoV High Entropy Alloy
CrNiTiMoV high entropy alloy was prepared by vacuum arc melting and was annealed at 600℃,700℃,800℃and 900℃for 2 h.X-ray diffraction analysis,scanning electron microscopy,energy spectrum analysis,dynamic potential polarization corves and micro Vickers hardness test were conducted to study the effects of annealing treatment on the microstructure,hardness and corrosion resistance of the alloy.The results show that CrNiTiMoV high entropy alloy has typical dendrite morphology,and the crystal structure is composed of simple BCC phase,a small number of NiTi phases and Ti rich phase.No new phase appears after CrNiTiMoV high entropy alloy annealing at different temperatures.As the annealing temperature increases,the rich Ti precipitation enhancement makes the alloy hardness rise harder than the cast alloy hardness of 517 HV.After annealing at 800℃/2 h,the alloy hardness reaches a maximum of 684 HV.After 600℃/2 h annealing,the alloy corrosion resistance is significantly improved,but with the increase of the annealing temperature,the alloy grain coarsening and the precipitation of Ti-rich phase leads to uneven Ti distribution and reduces the overall corrosion resistance.
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