Study of Crystallization and Magnetic Properties in Fe72-xNd7B21Nbx(x=0~4.0)Bulk Alloys
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Shanghai University,Shanghai University,Shanghai University,Shanghai University of Engineering Science,Shanghai University,Shanghai University
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TG132.2+72
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Abstract:
Fe72-xNd7B21Nbx(x=0~4.0)bulk alloys with diameter of 2 mm were fabricated by copper mold casting. The influence of Nb addition on the glass forming ability, crystallization and magnetic properties have been investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), vibrating sample magnetometer (VSM) and physical property measurement system (PPMS). The results show that appropriate addition of Nb can improve the glass forming ability. The fully amorphous ingots are obtained when Nb content is 2.0 at%, 2.2 at% and 2.5 at%. Nb is found to be effective in adjusting the alloy composition and decreasing the volume fraction of paramagnetic Nd1.1Fe4B4 phase . When Nb content is 2.5 at%, the alloy exhibits optimal hard magnetic properties with the remanence (Br) of 0.63 T, intrinsic coercicity (Hci) of 448.97 kA/m and maximum energy product ((BH)max) of 4.54 MGOe. The enhanced magnetic properties can be abscribed to the strong exchange coupling among grains and and high remanence.
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[Huang Xiaoqian, Xu Hui, Tan Xiaohua, Wang Tonghui, Zhang Qing, Hou Xueling. Study of Crystallization and Magnetic Properties in Fe72-xNd7B21Nbx(x=0~4.0)Bulk Alloys[J]. Rare Metal Materials and Engineering,2018,47(1):214~218.] DOI：[doi]