【摘要】 研究了经过不同热处理的ＮｄＦｅＢ系纳米晶复合永磁合金的磁滞行为，根据磁滞回线一阶导数 曲线ｄＭ／ｄＨ～Ｈ分析了双相磁体磁滞回线Ｍ～Ｈ的变化情况，采用ＸＲＤ和ＴＥＭ对各典型回线 对应的样品组织结构进行了观测分析，在欠时效和过时效条件下，ｄＭ／ｄＨ～Ｈ曲线均出现双峰，但对 应不同的显微组织和不同的机制．在峰值时效条件下，合金由２：１４：１和α－Ｆｅ双相组成，ｄＭ／ｄＨ～Ｈ 曲线由单峰组成，磁滞回线表现为单相磁体的磁滞行为。更多还原

【Abstract】 Hysteresis behavior of nanocomposite NdFeB magnet under different annealing treatment was investigated. The characteristic change of typical M - H hysteresis loops was analyzed using dM/dH - H curves. The microstructures of samples corresponding to typical hysteresis loops were studied by TEM and XRD method. Two peaks appear in dM/dH - H curves of samples under both underage and postage treatment, but with different microstructure and mechanism. There is only one peak in the dM/dH - H curve under peak-aging treatment, the hysteresis loop of sample consisted of 2:14:1 and α-Fe phases has characteristic of smooth single-phase type demagnetization curve.更多还原