Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994479 | Journal of Alloys and Compounds | 2018 | 7 Pages |
Abstract
Nanocomposite hard magnets in the form of cones have been synthesized by rapid solidification process with Nd7.5Y2.7Fe62B22.3Nb3.1Cu2.4 alloy. X-ray diffraction studies deduced that as-cast alloys have a mixture of α-Fe, Fe3B, Nd2Fe14B and amorphous phase which, upon annealing, transformed into α-Fe, Fe3B and Nd2Fe14B magnetic phases. Transmission electron microscopy and three dimensional atom probe analysis elucidated a nanocrystalline microstructure consists of magnetically soft α-Fe, Fe3B and hard Nd2Fe14B nanograins. The good hard magnetic properties such as remanence (Br) of 0.45 T, coercivity (iHc) of 1315 kA/m and maximum energy product (BH)max of 56.7 kJ/m3 were obtained after annealing the Nd7.5Y2.7Fe62B22.3Nb3.1Cu2.4 alloy at 1013 K for 15 min. Henkel plot yielded the existence of strong inter-grain exchange interactions between magnetically soft and hard grains. High coercivity of 1315 kA/m for the optimally annealed Nd7.5Y2.7Fe62B22.3Nb3.1Cu2.4 alloy is ascribed to the large volume fraction of hard magnetic phase, high magnetocrystalline anisotropy and interface effects.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Shan Tao, Zubair Ahmad, Pengyue Zhang, Xiaomei Zheng, Suyin Zhang, Ning Pang,