【摘要】 研究了Nd8.5Fe77.6B6.4Co4Zr3Cu0.5合金晶化处理后的微观结构。研究发现,该合金15m/s淬态薄带只存在一个较宽的晶化峰,其晶化后的晶粒尺寸均匀性较差,晶化相中存在少量Fe77.2Nd22.8相,削弱了晶粒间的交换耦合作用。三维原子探针分析表明,Cu几乎不固溶于α-Fe,和Zr元素共同富集于Fe77.2Nd22.8相区。这些相的存在,使得合金的剩余磁化强度和磁滞回线的方形度降低,进而降低了合金的综合磁性能。更多还原

【Abstract】 Microstructure of as-spun Nd8.5Fe77.6B6.4Co4Zr3Cu0.5 ribbons after annealing treatment was investigated.Results show that the as-spun ribbons with the wheel speed of 15 m/s only have one exothermic peak,which is so wide that the grain size distribution is inhomogeneous for the annealed ribbons.A few Fe77.2Nd22.8 phases were found in the annealed ribbons,reducing the interaction coupling between the soft-magnetic and hard-magnetic phases.The analysis of three dimensional atom probe(3DAP) revealed that Cu atoms were almost insoluble in α-Fe phase,enriching in Fe77.2Nd22.8 phase together with Zr atoms.These phases reduced the remanence and squareness of the hysteresis loop,resulting in the decrease of the integrated magnetic properties.更多还原