Effect of annealing treatment on microstructure and mechanical properties of CoCrFeNiB0.05Ti0.6 high entropy alloy

doi:10.13251/j.issn.0254-6051.2023.02.024

Abstract

Abstract: The high entropy alloy powder of CoCrFeNiB_0.05Ti_0.6 was prepared by means of mechanical alloying method, and the CoCrFeNiB_0.05Ti_0.6 high entropy alloy was sintered by the powder metallurgy method. Then the sintered specimens were annealed at 450, 650 and 850 ℃ for 12 h, respectively. The phase structure of the CoCrFeNiB_0.05Ti_0.6 high entropy alloy before and after annealing were analyzed by using the X-ray diffractometer, the microstructure morphology and elemental distribution of the CoCrFeNiB_0.05Ti_0.6 high-entropy alloy before and after annealing were analyzed by SEM and EDS, while the Vickers hardness and compression strength of the specimens were measured by HXD-1000 Vickers hardness tester and WDW-200 universal experimental tester, respectively. The results show that the sintered alloy is mainly FCC phase accompanied by a small amount of HCP and Laves phase. And new phases such as BCC and borides are generated successively as the annealing temperature increasing. Furthermore, it can be seen that the diffusion of the element Cr from light gray dendrites to dark gray dendrites grows gradually, and the element B forms new borides with other elements. The sintered alloy is dendrite and interdendrite structure, and the proportion of interdendrite structure increases and dendrite structure decreases after annealing. In addition, the higher the annealing temperature is, the greater hardness and compressive strength of the CoCrFeNiB_0.05Ti_0.6high entropy alloy will be, reaching maximum values of 391.40 HV0.2 and 664.6 MPa respectively after annealing at 850 ℃, which is the results of combined effects of solid solution strengthening, fine grain strengthening, and second phase strengthening.

Key words: high entropy alloy, annealing heat treatment, phase structure, hardness, compressive strength

CLC Number:

TG113

Jiang Yue, Tan Yaping, Zhu Baixiang, Zhang Tiandong. Effect of annealing treatment on microstructure and mechanical properties of CoCrFeNiB_0.05Ti_0.6 high entropy alloy[J]. Heat Treatment of Metals, 2023, 48(2): 158-163.

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Effect of annealing treatment on microstructure and mechanical properties of CoCrFeNiB_0.05Ti_0.6 high entropy alloy

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