| 2 | Nanocrystalline exchange-coupled Pr-Fe-B permanent magnets显示文摘Nanocomposite Pr2Fe14B/α-Fe permanent magnets were prepared by melt spinning and subsequent crystallizahon of Pr8Fe86B6, amorphous Precursnors. The microstructure is a two-phase nanocomposite of Pr2 Fe14 B and softmagnetic α-Fe with an average size of 30nm. X-ray diffration, Thermomagnetic analysis and TEM analy0sis indicatetha amorphous Pr8Fe86B6, alloy crystallizes through the process of Am→Am→Am’+α-Fe→Pr2Fe23B3+α-Fe-Pr2Fe14B+α-FeThe highest value of remanence (Br), cocreivity (Hci) and maximum energy Product ((BH)max) of the nanocrystallinealloys are 1.10T, 340 kA/m and 110 kJ/m3 respechvely, exhibihng remarkable remanence enhancement. The effect ofannaling temperature and time on the microstructure and magnetic properties was also studied. The resultS show thatappropriate annealing temperature and time are important for obtaining the optimal microstructure and the bestmagnetic properties. | WANG Zuocheng ZHANG Maocai QIAO Yi GAO Xuexum LI Fubiao ZHOU Shouzeng WANG Run( State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) ( Materials Science and Engineering School, | 1997 | International Journal of Minerals,Metallurgy and Materials1997，11，3： | 0 |
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