無容器凝固プロセスによるNd<SUB>2</SUB>Fe<SUB>14</SUB>B相の直接成長

書誌事項

タイトル別名
  • Direct Growth of Nd<SUB>2</SUB>Fe<SUB>14</SUB>B Phase by Containerless Processing
  • 無容器凝固プロセスによるNd2Fe14B相の直接成長
  • ムヨウキ ギョウコ プロセス ニ ヨル Nd2Fe14Bソウ ノ チョクセツ セイチョウ

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抄録

Nd2Fe14B molten alloy droplets were containerlessly solidified using a 25 m drop tube. The relationship between the sample diameter and the microstructure was investigated. The diameter of the resultant spherical samples was in the range from 150 to 2000 μm. When sample diameter was larger than 500 μm, the microstructure of the spherical sample consisted of the α-Fe phase embedded in the Nd2Fe14B matrix within entire sections. In the spherical sample with diameter of 400 μm, the microstructures consisted of two regions, one was Nd2Fe14B columnar grains and the other was α-Fe phase embedded in Nd2Fe14B matrix. The columnar Nd2Fe14B region expanded as the sample diameter decreased from 400 μm to 350 μm. When sample diameter reduced to 250 μm, the microstructure of the spherical samples consisted of the pure Nd2Fe14B dendrite without any α-Fe phase.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 68 (6), 362-366, 2004

    公益社団法人 日本金属学会

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