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

在过去的一个会计年度，我通过微量添加Nb来优化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条带表面的异常晶粒生长。结果表明，掺杂铌的热变形磁体消除了晶粒错位，获得了1.54 T的高剩余量。此外，铌的掺入还优化了边面晶界相的组成，从而提高了矫顽力。高剩余磁化强度使该样品成为应用共晶扩散工艺进一步提高矫顽力的合格起始样品。在此基础上发表了一篇期刊论文，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.