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通过铜模吸铸法制备出了Nd_(60)Fe_(20)Co_(10)Al_(10)大块非晶合金,研究了该合金在晶化过程中的结构与磁性能,并利用等待时间法研究了其在晶化过程中的磁粘滞行为,结果表明:在453~783 K温度退火时,合金的磁性能变化不大。当退火温度高于783 K时,合金的剩余磁化强度(M_r)、饱和磁化强度(M_s)和矫顽力(_iH_c)的值均急剧降低,在803K退火后,合金完全晶化,铁磁性消失。当合金在703和753 K退火后,合金的激活体积v_a和激活直径Da的数值变化不大,而合金的扰动场H_f则呈现先上升后下降的现象,并且在703 K时达到最大值,这是因为703 K样品中存在的亚稳相造成了扰动场的增加。此外,还讨论了这些微观磁性参数与合金宏观磁性能的关联性。
The bulk Nd_ (60) Fe_ (20) Co_ (10) Al_ (10) bulk amorphous alloy was prepared by copper mold suction casting. The structure and magnetic properties of Nd_ Method was used to study the magnetic behavior of the alloy during the crystallization process. The results show that the magnetic properties of the alloy have little change when annealed at 453 ~ 783 K. When the annealing temperature is higher than 783 K, the remanent magnetization (M_r), saturation magnetization (M_s) and coercive force (_iH_c) decrease sharply. After 803K annealing, the alloy completely crystallizes and the ferromagnetism disappears . When the alloy is annealed at 703 and 753 K, the values of the activation volume v_a and the activation diameter Da of the alloy do not change much, while the disturbance field H_f of the alloy first increases and then decreases, reaching the maximum value at 703 K Because the metastable phase present in the 703 K sample caused an increase in the perturbation field. In addition, the relationship between these micro-magnetic parameters and the macroscopic magnetic properties of the alloys is also discussed.