Effect of annealing temperature on microstructure and properties of CrFeCoNiTi1.5 high entropy alloy

doi:10.13251/j.issn.0254-6051.2020.03.021

Abstract

Abstract:

In order to study the effect of medium and low temperature heat treatment on properties of CrFeCoNiTi_1.5 high entropy alloy, the high entropy alloy was annealed at 200, 400 and 600 ℃ for 10 h, respectively. The microstructure, surface morphology and segregation of the elements were analyzed by X-ray diffraction, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). Simultaneously, the dynamic potential polarization curves and Vickers hardness of the high entropy alloy were also tested by microhardness tester and electrochemical workstation. The results show that the increase of annealing temperature is favorable to the precipitation of HCP structure phase of the CrFeCoNiTi_1.5 high entropy alloy. With the increase of temperature, Cr, Fe, Co and Ni gradually aggregate into and distribute inside the grains, while Ti gradually aggregates to the intergranular region. When annealed at 600 ℃, the corrosion resistance of the CrFeCoNiTi_1.5 high entropy alloy reaches the optimal value, and the Vickers hardness is 914 HV0.5.

Key words: CrFeCoNiTi_1.5 high entropy alloy, annealing, microstructure, Vickers hardness, corrosion resistance

CLC Number:

TG156.2

Jiang Yue, Zhou Guangtai, Cheng Simeng, Li Xiuming. Effect of annealing temperature on microstructure and properties of CrFeCoNiTi_1.5 high entropy alloy[J]. HTM, 2020, 45(3): 108-113.

References

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Effect of annealing temperature on microstructure and properties of CrFeCoNiTi_1.5 high entropy alloy

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