Effects of Nb substitution for Zr on the phases, microstructure and magnetic properties of Co₈₀Zr_{18鈭?span style='font-style: italic'>x}Nb_xB₂ melt-spun ribbons

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• 作者：Zhipeng Hou^a ; Jinbao Zhang^a ; Shifeng Xu^b ; Chunji Wu^a ; Jingjing Zhang^a ; Zihan Wang^a ; Kunlong Yang^a ; Wenquan Wang^a ; ^{wangwq@jlu.edu.cn} ; Xiaobo Du^a ; Feng Su^a
• 关键词：Co&ndash ; Zr&ndash ; Nb&ndash ; B alloys ; Melt-spun ribbons ; Coercivity ; Co11Zr2 phase ; Permanent magnets
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：September, 2012
• 卷：324
• 期：18
• 页码：2771-2775
• 文件大小：1080 K

摘要

The phases, microstructure, and magnetic properties of Co₈₀Zr_18鈭?em>xNb_xB₂ (x=1, 2, 3, and 4) melt-spun ribbons were investigated. The small substitution of Nb for Zr in the Co-Zr-B melt-spun ribbons resulted in the improvement of magnetic properties, especially the coercivity. The main effect of added Nb on the coercovity of Co-Zr-Nb-B melt-spun ribbons, originated from modification of the grain size of Co₁₁Zr₂ phase. The coercivity of the Co-Zr-Nb-B melt-spun ribbons depends on the annealing temperature. The optimal magnetic properties of H_c=5.1 kOe, and (BH)_max=3.4 MGOe were obtained in the Co₈₀Zr₁₅Nb₃B₂ melt-spun ribbons annealed at 600 掳C for 3 min.