退火加热速度对Fe-Cu-Nb(V)-Si-B纳米晶合金磁性的影响

研究了退火温度为550℃的纳米晶化过程中加热速度对Fe_72.7Cu₁Nb₂V_1.8Si_13.5B₉与Fe_73.5Cu₁Nb₃Si_13.5B₉合金磁性的影响．磁性测量结果表明，退火加热速度对这两种合金软磁性能有明显的影响，快速加热可显著提高合金的初始磁导率μ_{i 关键词：}

INFLUENCE OF HEATING RATE DURING ANNEALING ON MAGNETIC PROPERTIES OF NANOCRYSTALLINE Fe-Cu- Nb(V)-Si-B ALLOYS

Influence of heating rate on magnetic properties for Fe_72.7Cu₁Nb₂V_1.8Si_13.5B₉ alloy and Fe_73.5Cu₁Nb₃Si_13.5B₉ alloy in nanocrystallization at 550℃ was investigated.Magnetic measurements showed that the effect of heating rate on permeability was significant,the initial permeability μ_i was significantly increased by quick heating.For Fe_72.7Cu₁Nb₂V_1.8Si_13.5B₉ alloy,when heating rate was raised from 2℃/min to 260℃/min, μ_i was increased from 42000 to 81000; for Fe_73.5Cu₁Nb₃Si_13.5B₉ alloy,when heating rate was raised from 0.5℃/min to 260℃/min,μ_i was increased from 26000 to 92000.It was found that the grain size was decreased by quick heating.For Fe_72.7Cu₁Nb₂V_1.8Si_13.5B₉ alloy,when heating rate was raised from 2℃/min to 260℃/min,the grain size was decreased from 14.6nm to 13.1nm;for Fe_73.5Cu₁Nb₃Si_13.5B₉ alloy,when heating rate was raised from 0.5℃/min to 260℃/min,the grain size was decreased from 13.1nm to 10.6nm.This suggested that the effect of heating rate on permeability was caused mainly by the changes of grain size.The plot of grain size and μ_i showed that μ_i∝D^-6 ,where D is the average size of the grains.The nucleation frequency and growth rate of α-Fe(Si) vs.heating rate of annealing were also discussed.