Ndb>5b>Feb>64b>Bb>23b>Mob>4b>Yb>4b> bulk nanocomposite permanent magnets produced by crystallizing amorphous precursors

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• 作者：Shan Tao^a ; ^c ; Tianyu Ma^a ; ^{maty@zju.edu.cn} ; Zubair Ahmad^b ; Hong Jian^a ; Mi Yan^b ; ^{mse_yanmi@zju.edu.cn}
• 关键词：Nanocomposite ; Magnetic property ; Glass forming ability
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：1 April, 2012
• 卷：358
• 期：6-7
• 页码：1028-1031
• 文件大小：666 K

摘要

The glass forming ability and magnetic properties of Ndb>5b>Feb>68 鈭?#xA0;xb>Bb>23b>Mob>4b>Yb>xb> (x = 0, 2, 4, 6) alloys prepared by copper mold casting technique have been studied. Amorphous rods with a diameter of 2 mm were obtained in the Ndb>5b>Feb>64b>Bb>23b>Mob>4b>Yb>4b> alloy. After annealing for 10 min at 1013 K, the Ndb>5b>Feb>64b>Bb>23b>Mob>4b>Yb>4b> alloy showed optimal hard magnetic properties with the coercivity of 764.2 kA/m, remanence of 0.6 T and maximum energy product of 57.3 kJ/m³, respectively. The enhanced magnetic properties can be ascribed to the strong exchange coupling among the magnetically soft 伪-Fe (25-30 nm), Feb>3b>B (30-35 nm) and hard Ndb>2b>Feb>14b>B (40-50 nm) grains present in the magnet microstructure. Large size bulk nanocomposite magnets with sound magnetic properties make the Nd-Fe-B-Mo-Y alloy system a promising candidate for industrial applications.