Fabrication of Fe- and Co-based metallic glasses and their high functional properties

在本财政年度，发现了晶化前大过冷液相区达到100K的铁基金属玻璃。金属玻璃的最大直径可达5 mm。此外，在Co基金属玻璃中还发现了较大的过冷液相区，最大过冷液相区可达88K。这使我们能够制作最大厚度为5 mm的块状样品。在此基础上，采用熔剂处理法制备了铁基多元金属玻璃棒状金属玻璃。这种制备方法使我们能够在低冷却速度下制备最大厚度为4 mm的块体金属玻璃。助熔剂处理方法能有效地降低矫顽力，使过冷液相区增大30%。除Pd基金属…外，Fe基金属玻璃的非晶形成能力、过冷液相区稳定性和软磁性能也得到了有效的提高更多的IC眼镜。在此基础上制备了具有良好软磁性能的环状大块金属玻璃。应用基础研究正在推进中。利用晶化前过冷液相区的粘性流动变形，变形后的Fe、Co基金属玻璃表现出与低速冷却金属玻璃相同的良好软磁性能。在不降低软磁性能的前提下，采用粉末固结法制备了块体非晶合金，证明了粉末固结法制备块体金属玻璃的可行性。含3~4个原子分数稀土金属的铁基非晶玻璃的过冷液相区温度为50K，少量的添加提高了玻璃的形成能力，形成了厚度为几毫米的块状非晶玻璃。此外，还发现经过适当的退火处理后的金属玻璃具有剩余金属玻璃与纳米晶相的混合结构，并具有良好的硬磁性能。这些结果作为一种制备新型永磁块体材料的新工艺引起了人们的关注。较少

In this fiscal year Fe-base metallic glasses with the large supercooled liquid region before crystallization reaching 100K were found. The maximum diameter of the metallic glasses reaches as large as 5 mm. In addition, large supercooled liquid region of maximum 88 K was found in Co-base metallic glasses. This enable us to fabricate bulk shape specimens with a maximum thickness of 5 mm. Furthermore, rodshaped metallic glasses were prepared with a flux treatment for the Fe-based multicomponent metallic glasses. This preparation method enable us to prepare bulk metallic glasses with maximum thickness of 4 mm even in a low cooling rate. The flux treatment method is effective for decreasing coercivity and increasing supercooled liquid region by 30 %. The glass-forming ability, the stability of supercooled liquid region and the soft magnetic properties increase effectively applying the flux method, by which molten alloy is cleaned, for Fe-based metallic glasses in addition to Pd-based metall … More ic glasses. Based on the findings, ring-shaped bulk metallic glasses with good soft magnetic properties were prepared. Basis research for application is under promoting. The deformed Fe- and Co based metallic glasses, utilizing viscous flow deformation in the supercooled liquid region before crystallization, shows as good soft magnetic properties as metallic glasses prepared by low cooling rate. Bulk metallic glasses were succeeded in preparing by powder consolidation undegrading soft magnetic properties, The consolidation method is found to be appropriate for the fabrication of bulk metallic glasses. Fe based metallic glasses containing lanthanide metals as small as 3 to 4 atomic percent shows supercooled liquid region of 50 K.The small addition increase the glass-forming ability, resulted in fabricating bulk shaped metallic glasses with a several millimeters thickness. Furthermore, metallic glasses subjected appropriate annealing are found to have mixture structure of remaingn metallic glasse with nanometer sized crystalline phase and have good hard magnetic These results attracts attention as a new process to make new permanent magnet bulk materials. Less