Effect of annealing on microstructure, mechanical properties and magnetic properties of FeCoNi2-xMnGax high-entropy alloys

doi:10.13251/j.issn.0254-6051.2024.01.004

Abstract

Abstract: FeCoNi_2-xMnGa_x(x=0, 0.5, 0.75, 1.0, 1.25) high-entropy alloy ingots were prepared by non-consumable vacuum arc melting furnace, and then annealed at 800 ℃ and 1000 ℃ for 8 h. The effects of annealing on microstructure, mechanical properties and magnetic properties of the alloys were studied. The results show that with the increase of Ga content, the microstructure of the as-cast alloy changes from single FCC phase without Ga (x=0) to FCC+BCC dual phase, then to single BCC phase with 25at%Ga (x=1.25). After annealing at 800 ℃ and 1000 ℃, rod-like precipitates form inside the FCC phase. The compressive properties and magnetic properties of the FeCoNi_2-xMnGa_x alloy with dual phase are good, and improved after annealing. The FeCoNi_1.25MnGa_0.75 alloy annealed at 1000 ℃ possesses the best compressive performance, its compressive stress are 1852.5 MPa when the deformation amount is 20%. The FeCoNi_1.0MnGa_1.0 alloy annealed at 1000 ℃ possesses the highest saturation magnetization of 121.8 emu/g.

Key words: high-entropy alloy, annealing treatment, microstructure, mechanical properties, magnetic property

CLC Number:

Zhu Jiawu, Ouyang Sheng. Effect of annealing on microstructure, mechanical properties and magnetic properties of FeCoNi_2-xMnGa_x high-entropy alloys[J]. Heat Treatment of Metals, 2024, 49(1): 22-31.

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Effect of annealing on microstructure, mechanical properties and magnetic properties of FeCoNi_2-xMnGa_x high-entropy alloys

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