AlNiCo合金中α₁相取向程度对磁稳定性的影响

AlNiCo alloy has excellent temperature stability and magnetic stability, and is widely used in inertial instruments, where its magnetic stability has a significant impact on the accuracy and lifetime of the instrument. The AlNiCo alloy mainly includes the strongly magnetic α₁ phase and the weakly magnetic α₂ phase. Normally, the α₁ phase with consistent orientation provides the coercivity and magnetization strength for the magnet. In this paper, the orientation of α₁ phase is controlled by magnetic field heat treatment to study its influence law on magnetic stability and explore new ideas to improve the magnetic stability of AlNiCo alloy. It is found that the randomly oriented AlNiCo-0 sample has lower coercivity and remanence, but possesses lower magnetic viscosity coefficient and better stability than the anisotropic AlNiCo-0.25 sample, which is mainly due to its smoother energy barrier distribution. The results of the micromagnetic simulations further indicate that the α₁ phase oriented perpendicular to the easy axis is more conducive to the formation of a stable magnetic domain structure.