Direct Crystallization of the Nd2Fe14B Peritectic Phase by Containerless Solidification in a Drop Tube

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書誌事項

タイトル別名
  • Direct Crystallization of the Nd<SUB>2</SUB>Fe<SUB>14</SUB>B Peritectic Phase by Containerless Solidification in a Drop Tube
公開日
2003
資源種別
journal article
DOI
  • 10.2320/matertrans.44.806
公開者
公益社団法人 日本金属学会

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説明

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 range of 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 matrix of the Nd2Fe14B phase within entire sections. In the spherical sample with diameter of 400 μm, the microstructures consisted of two regions, one was columnar grains of the Nd2Fe14B phase and the other was α-Fe phase embedded in matrix of the Nd2Fe14B phase. The columnar Nd2Fe14B region expanded as the sample diameter decreased from 400 to 350 μm. When sample diameter reduced to 250 μm, the microstructure of a spherical sample consisted of the pure dendritic Nd2Fe14B phase without any α-Fe phase.

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