采用热压热变形技术,制得了各向异性致密(NdDy)11．5 Fe81．5 Nb 1 B6＋2％(质量分数)Zn 磁体,并研究了热压及热变形磁体的微观结构以及不同形变量对磁体磁性能和微观结构的影响.结果表明,Zn 的添加使热压磁体磁性能下降,但使热变形磁体磁性能大幅增加；热变形磁体磁性能的增加是由于良好 c 轴取向和微观结构的形成.此类磁体磁性能和微观结构随形变量的增加表现出与传统磁体类似的规律,即剩磁增加、矫顽力下降,c 轴取向不断增强.尽管如此,在热变形的起始阶段,由于 Zn 的扩散使磁体矫顽力有较大幅度增加.磁体的形变量过大达75％时,磁体磁性能会因为晶粒严重长大而下降.
Anisotropic bulk (NdDy)1 1 .5 Fe8 1 .5 Nb 1 B6 +2wt%Zn magnets were prepared by applying hot-pressing and hot-deformation.The microstructure of hot-pressed and hot-deformed magnets and effects of different de-formation on the microstructure and magnetic properties were studied.The results showed that after Zn addition the magnetic performance of hot-pressed magnets decreased,but that of hot-deformed magnets increased large-ly,resulting from the formation of good c-axis texture and microstructure.The trend of the magnetic properties and microstructure with the deformation was similar to that of traditional Nd-rich magnets,and that c-axis tex-ture and remanence increased but coercivity decreased.However,the coercivity of hot-deformed magnets in-creased due to the strong diffusion of Zn during the initial stage of hot-deformation.When the deformation in-creased to 75%,the performance decreased due to the coarse and uneven grains.
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