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

铁基和钴基金属玻璃的制备及其高功能性能

基本信息

批准号：
10305049
负责人：
INOUE Akihisa
金额：
$ 24.58万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305049/
关键词：
metallic glass iron base alloy cobalt base alloy supercooled liquid region soft magnetic properties 過冷却液体パルク金属ガラス鉄基金属ガラスコバルト基金属ガラス機械的性質

项目摘要

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

本会计年度发现铁基金属玻璃在结晶前存在较大过冷液区，达到100K。金属玻璃的最大直径可达5mm。此外，在钴基金属玻璃中发现了较大的过冷液区，最大可达88 K。这使我们能够制造最大厚度为5毫米的大块形状样品。在此基础上，对铁基多组分金属玻璃进行熔剂处理，制备了棒状金属玻璃。这种制备方法使我们能够在低冷却速率下制备最大厚度为4mm的大块金属玻璃。磁通处理方法可有效降低矫顽力，使过冷液面积增大30%。除钯基金属玻璃外，采用熔剂法对熔液进行清洗，可有效提高铁基金属玻璃的玻璃化能力、过冷液区的稳定性和软磁性能。在此基础上，制备了具有良好软磁性能的环形大块金属玻璃。应用基础研究正在推进中。变形后的铁、钴基金属玻璃在结晶前利用过冷液区的粘性流动变形，表现出与低冷却速率制备的金属玻璃一样好的软磁性能。采用粉末固结方法制备了不降低软磁性能的大块金属玻璃，证明了这种固结方法是制备大块金属玻璃的理想方法。含镧系金属的铁基金属玻璃的原子量只有3 ~ 4个百分点，显示出50 K的过冷液区。少量的添加量增加了玻璃的成形能力，从而制造出几毫米厚的大块形状的金属玻璃。此外，经过适当退火处理的金属玻璃具有残余金属玻璃与纳米级晶相的混合结构，并且具有良好的硬磁性。这些结果作为一种制备新型永磁体材料的新工艺引起了人们的关注。少