退火对FeCoNi2-xMnGax高熵合金微观组织、力学性能和磁性能的影响

doi:10.13251/j.issn.0254-6051.2024.01.004

摘要/Abstract

摘要： 利用非自耗真空电弧熔炼炉制备FeCoNi_2-xMnGa_x(x=0, 0.5, 0.75, 1.0, 1.25)高熵合金铸锭,然后在800 ℃和1000 ℃退火8 h,研究了退火对高熵合金微观组织、力学性能和磁性能的影响。结果表明,随着Ga含量的增加,铸态合金组织由未添加Ga时(x=0)的FCC单相过渡到FCC+BCC双相,最终在Ga含量为25at%时(即x=1.25)转变为BCC单相。经过800 ℃和1000 ℃退火后,在FCC相内产生了棒状的析出物。双相组织的FeCoNi_2-xMnGa_x合金具有较好的磁性能和压缩性能,退火后合金的力学性能和磁性能均有所提高。FeCoNi_1.25MnGa_0.75合金1000 ℃退火后的力学性能最优,在形变量约为20%时的抗压强度为1852.5 MPa。FeCoNi_1.0MnGa_1.0合金1000 ℃退火后的饱和磁化强度最大,为121.8 emu/g。

关键词: 高熵合金, 退火处理, 显微组织, 力学性能, 磁性能

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

中图分类号:

朱嘉武, 欧阳晟. 退火对FeCoNi_2-xMnGa_x高熵合金微观组织、力学性能和磁性能的影响[J]. 金属热处理, 2024, 49(1): 22-31.

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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