Development of anisotropic high-coercivity in ultrafine-grain hot-deformed magnets

在过去的财政年度，我通过微量添加Nb优化了晶粒尺寸和晶粒形状。结果表明，微量Nb的加入可以抑制初始薄带表面晶粒的异常长大。结果表明，Nb掺杂的热变形磁体不仅消除了晶粒错位，获得了1.54T的高剩磁，而且优化了侧平面晶界相的成分，提高了磁体的矫顽力。高剩磁使该样品成为应用共晶扩散过程以进一步增加矫顽力的合格起始样品。基于这项研究，发表了一篇期刊文章，并申请了一项日本专利。

In the past fiscal year, I optimized the grain size and grain shape by trace addition of Nb. It has demonstrated that trace addition of Nb can suppress the abnormal grain growth at the surface of initial ribbons. Consequently, the misaligned grains has been eliminated and high remanence of 1.54 T was achieved in Nb-doped hot-deformed magnets.In addition, the composition of side-plane grain boundary phase was also optimized by Nb doping and coercivity was thus improved. High remanent magnetization makes this sample as a competent starting sample for applying the eutectic diffusion process to further increase the coercivity. Based on this research, one journal article was published and one Japanese patent is under application.