Effect of Annealing on the Magnetic and Mechanical Properties of AlCoCrCuFeNi High-entropy Alloy Prepared by the Laser Powder Bed Fusion

doi:10.3901/JME.260082

Abstract

Abstract: Heat treatment phase transition is a key factor affecting the magnetic and mechanical properties of high-entropy alloys (HEAs). AlCoCrCuFeNi HEAs were prepared by a laser powder bed fusion (LPBF) method and the effects of annealing at different temperatures (600-1 100 ℃) on the microstructures, magnetic and micromechanical properties of AlCoCrCuFeNi HEAs were studied. The results show that the printed alloy is randomly oriented columnar crystals with ordered BCC matrix phase and a small amount of FCC precipitated phase, which epitaxially growth along the molten pool. With the increase of annealing temperature, the alloy underwent recovery and recrystallization process accompanied by the FCC phase gradually separated from the BCC phase matrix and occupied the dominant position. Both the printed and annealed alloys exhibit excellent mechanical properties, while the nanohardness and vickers hardness increase first and then decrease with the increase of annealing temperature. When the annealing temperature is 600 ℃, the nanohardness and vickers hardness of the sample are the highest, which are 9.57 GPa and 692.6 HV, respectively.The samples showed typical semi-hard magnetic properties with the saturation magnetization (M_s) and coercivity (H_c) first increased and then decreased with the increase of annealing temperature, but the magnetic crystal anisotropy constant (k₁) showed a trend of increasing first, then decreasing and increasing again. When the annealing temperature is 600 ℃, both M_s and H_c have the maximum values, which are 60.12 A·m²/kg and 7.16 kA/m respectively. This work can provide certain research ideas for the subsequent adjustment of the microstructure and comprehensive magnetic properties of HEAs through annealing processes.

Key words: AlCoCrCuFeNi HEA, LPBF, heat-treatment, microstructure, magneitic properties, nanoindentation/vickers hardness

CLC Number:

TG132

HU Xuzhao, ZHANG Dianbao, XU Zhenlin, CHEN Xianglin, FANG Fang, XIA Ailin. Effect of Annealing on the Magnetic and Mechanical Properties of AlCoCrCuFeNi High-entropy Alloy Prepared by the Laser Powder Bed Fusion[J]. Journal of Mechanical Engineering, 2026, 62(3): 235-247.

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