Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
Japan Aerospace Exploration Agency Institute of Space and Astronautical Science
Tokai University
Tokai University
Sumitomo Special Metals Co. Ltd.
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
雑誌名
宇宙利用シンポジウム 第20回 平成15年度
雑誌名(英)
Space Utilization Research: Proceedings of the Twentieth Space Utilization Symposium
ページ
255 - 258
発行年
2004-03
抄録（英）
Containerless solidification of Nd14Fe79B7 alloys was carried out in a 25 m drop tube. The relationship among the sample size, microstructure, and magnetic properties were investigated. The resultant samples contained a large amount of a metastable phase with a chemical composition near that of the bulk alloy and a trigonal crystal structure similar to that of the Nd2Fe17 phase. The volume fraction of the metastable phase decreased as the sample diameter increased. The metastable phase was partially decomposed into very fine lamellar grains of Nd2Fe14B and some Nd-rich phase by a solid-state reaction in the sample with a diameter of 1,200 micrometer.
ドロップチューブ法によるNd-Fe-B合金の準安定凝固
