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Fe44Co20Nd7Nb4B25大塊非晶合金磁性及熱穩(wěn)定性研究
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國(guó)家自然科學(xué)基金(51071099, 51171101)


Magnetic Properties and Thermal Stability of Fe44Co20Nd7Nb4B25 Bulk Amorphous Alloy
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    摘要:

    采用銅模吸鑄法制備了Fe44Co20Nd7Nb4B25大塊非晶合金，利用差示掃描量熱儀 (DSC)、X射線衍射儀 (XRD)、高分辨透射電鏡 (HRTEM) 和振動(dòng)樣品磁強(qiáng)計(jì) (VSM) 研究了該合金的結(jié)構(gòu)、非晶形成能力、熱穩(wěn)定性及磁性能。結(jié)果表明：該合金為完全非晶結(jié)構(gòu)，在室溫下表現(xiàn)為良好的軟磁性，并具有較好的非晶形成能力和熱穩(wěn)定性，晶化激活能Ep為642 kJ/mol。退火后該合金表現(xiàn)為硬磁性，退火溫度為1003 K時(shí)，內(nèi)稟矯頑力iHc達(dá)到最大值，為1164 kA/m；退火溫度為963 K時(shí)，剩余磁感應(yīng)強(qiáng)度Br和最大磁能積(BH)max的值最大，分別為0.27 T和15.79 kJ/m3

    Abstract:

    Fe44Co20Nd7Nb4B25 bulk amorphous alloy was prepared by copper mold casting. The microstructure, glass-forming ability, thermal stability and magnetic properties were investigated by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). It is found that Fe44Co20Nd7Nb4B25 alloy with amorphous structure exhibits good soft magnetic property, excellent glass-forming ability and thermal stability. The value of activation energy, Ep, is 642 kJ/mol. The annealed sample shows hard magnetic behavior, and the maximum value of intrinsic coercivity (iHc) is 1164 kA/m after annealing at 1003 K. When annealed at 963 K, the values of remanence (Br) and maximum energy product ((BH)max) reaches a maximum of 0.27 T and 15.79 kJ/m3, respectively

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滿 華,徐 暉,譚曉華,唐永軍,白 琴,侯雪玲. Fe44Co20Nd7Nb4B25大塊非晶合金磁性及熱穩(wěn)定性研究[J].稀有金屬材料與工程,2013,42(9):1879~1882.[Man Hua, Xu Hui, Tan Xiaohua, Tang Yongjun, Bai Qin, Hou Xueling. Magnetic Properties and Thermal Stability of Fe44Co20Nd7Nb4B25 Bulk Amorphous Alloy[J]. Rare Metal Materials and Engineering,2013,42(9):1879~1882.]
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  • 收稿日期:2012-09-20
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