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用高能球磨的方法制备铁基纳米晶铁钴和铁镍合金,研究材料的结构与频率特性。结果表明:具有体心立方晶体结构样品的颗粒尺寸在0.5～5μm之间,尺寸分布较宽;而具有体心立方和面心立方混合晶体结构样品的在5～20μm之间,尺寸分布较窄。含钴样品的钴含量有提高样品截止频率的作用;样品的磁导率实部在掺杂量为7.69%(原子分数)时均出现极大值。Co掺杂的样品显示出弛豫型磁谱特征,而Ni掺杂样品则显示出共振型磁谱特征。Fe-Co样品在高频区域磁导率虚部随着掺杂量的增大而减小,同时随着掺杂量的增加,磁导率虚部最小值向高频区域移动。Fe-Ni样品的磁导率虚部最小值也随着掺杂量的增加向高频区域移动。纯铁样品则在高频区域磁导率虚部小于掺杂样品。
Iron-based nanocrystalline iron-cobalt and iron-nickel alloys were prepared by high energy ball milling to study the structure and frequency characteristics of the materials. The results show that the size of the samples with the body-centered cubic crystal structure is between 0.5μm and 5μm, and the size distribution is relatively wide. The samples with body-centered cubic and face-centered cubic mixed crystal structures have narrow size distribution between 5μm and 20μm . The cobalt content of the cobalt-containing sample increases the cut-off frequency of the sample; the real part of the permeability of the sample shows a maximum at a doping amount of 7.69% (atomic fraction). Co-doped samples show the characteristics of the relaxation magnetic spectrum, while Ni-doped samples show the characteristics of the resonant magnetic spectrum. Fe-Co samples in the high-frequency region of the imaginary part of the permeability decreases with increasing doping amount, while as the doping amount increases, the minimum imaginary part of the permeability moves to the high frequency region. The minimum value of the imaginary part of the permeability of the Fe-Ni sample also moves toward the high frequency region as the doping amount increases. In the pure iron sample, the imaginary part of the permeability in the high frequency region is smaller than that of the doped sample.