Crystallographic texture and domain structure of Nd3.8Dy0.7Pr3.5Fe86Nb1B5 nanocomposite prepared by direct rapid solidification
Strong crystallographic texture and high performance of Nd3.8Dy0.7Pr3.5Fe86Nb1B5 (containing 30wt％ α-Fe) nanocomposite permanent magnetic material was prepared by direct rapid solidification. X-ray diffraction analysis and magnetic measurement indicated that the ribbons have preferentially orientated. The easy magnetization direction switches from perpendicular to the ribbon plane to parallel to the ribbon plane direction as the wheel speed increased from 10m/s to 30m/s. The multigrain domains were observed by SPM in the ribbons prepared at wheel speed of 10-30m/s. The Henkel plots were employed to investigate the interactions of the grains in the samples. A very fine and uniform microstructure with the average grain size about 16nm was obtained in the sample prepared at wheel speed of 30m/s. The sample consists of highly oriented hard magnetic phase (Nd,Dy,Pr)2(Fe,Nb)14B and soft magnetic phase α-Fe. High performance of Br=1.29T, Mr/Ms= 0.76 and (BH)max=158.4 kJ/m3 were achieved originated from the strong crystallographic texture, fine and homogeneous microstructure and enhancement of the exchange coupling between the soft and hard magnetic phases in this sample. The mechanism of the formation of the crystallographic texture and the multigrain domains were discussed in this paper.
Nanocomposite material crystallographic texture rapid solidification Multigrain domain Exchange-coupling
刁树林 陈伟 赵旭 阎秀军
河北师范大学物理科学与信息工程学院 050016
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）