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�������պ����ѧѧ�� 2008, Vol. 34 Issue (09) :1041-1044    DOI:
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�������պ����ѧ ���Ͽ�ѧ�빤��ѧԺ, ���� 100191
Phase structure and magnetic properties of SmCo x-0.4 Ti0.4 ribbons
Zhang Yu, Yao Zan, Jiang Chengbao*
School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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ժҪ SmCo��x��-0.4Ti0.4(��x��=5.0, 5.5, 6.5, 7.0)�Ͻ�42�Qm/s�ٶ�˦�����������Ƴɱ���,������ȴ���¯��,����750�Q����Сʱ�ȴ���.���Ƶõ�˦��״̬���ȴ���״̬�Ͻ𱡴��ֱ��������ṹ�ʹ�����.�������:SmCo��x��-0.4Ti0.4�Ͻ�˦��״̬��Ʒ��ṹ��Co�����IJ�ͬ���仯,���Ъ�x��=5.0,5.5��6.5�ĺϽ���Ʒ��2�� 17��1�� 5����ṹ���;��x��=7.0�ɷ���Ʒ��1�� 7����ṹ���.˦��״̬��Ʒ�ıȱ��ʹŻ�ǿ�Ⱥͱ�ʣ��Ż�ǿ�Ȼ�������������,�����������ںϽ�ɷ�Ϊ��x��=5.0ʱ�������ֵ,Ϊ1.01�QT.������Ʒ�ȴ���ǰ����������׾��ṹ,���ֳ�ʣ����ǿЧӦ.��Ʒ������������ҪΪ�κ���,���Ż��κ˳���Ҫ��Դ��SmCoӲ�����Ĵž��������Լ������׾��ṹ.�ȴ����,����x��=7.0��Ʒ��,������Ʒ�������������½�.
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Abstract�� SmCo��x��-0.4Ti0.4(��x��=5.0,5.5,6.5 and 7.0) ribbons were prepared by melt-spinning at a wheel speed of 42�Qm/s, followed by annealing at 750�Q�� for 2 h.The phase structure and magnetic properties were measured for two types of ribbons, the as-spun and the as-spun/annealed. It was found that the phase structure of the as-spun ribbons changed with the Co content increasing. The as-spun samples with ��x��=5.0, 5.5 and 6.5 showed a 1�� 5 plus 2�� 17 phase structure. The ��x��=7.0 ribbons presented a single 1�� 7 phase structure. The specific saturation magnetization and the specific remanence increased almost linearly with the increasing of Co content. The maximum intrinsic coercivity of 1.01 T was obtained in the as-spun ribbons with ����x��=��5.0. Both of the two types showed a fine nanograin microstructure, and leaded to the remanence enhancement. The coercivity mechanism of the ribbons was mainly of the nucleation type, and the reversal magnetization nucleation field arised from the high uniaxial magnetocrystalline anisotropy of the hard phases and the nanograin microstructures. The intrinsic coercivities decreased after annealing, except the sample with ��x��=��7.0.��
Keywords�� permanent magnet   SmCo alloys   nanograin   magnetization   coercivity     
Received 2007-08-30;
About author: �� ��(1982-),Ů,�������绯��,˶ʿ��,phoebe_hope@126.com.cn.
����,Ҧ��,���ɱ�.SmCo��x��-0.4Ti0.4�Ͻ𱡴�����ṹ�ʹ�����[J]  �������պ����ѧѧ��, 2008,V34(09): 1041-1044
Zhang Yu, Yao Zan, Jiang Chengbao.Phase structure and magnetic properties of SmCo x-0.4 Ti0.4 ribbons[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(09): 1041-1044
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