Abstract
Nd2Fe14B molten alloy droplets were containerlessly solidified using a 25m 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 mm. When sample diameter was larger than 500 mm, the microstructure of the spherical sample consisted of the -Fe phase embedded in matrix of the Nd2Fe14B phase within entire sections. In the spherical sample with diameter of 400mm, the microstructures consisted of two regions, one was columnar grains of the Nd2Fe14B phase and the other was -Fe phase embedded in matrix of the Nd2Fe14B phase. The columnar Nd2Fe14B region expanded as the sample diameter decreased from 400 to 350 mm. When sample diameter reduced to 250mm, the microstructure of a spherical sample consisted of the pure dendritic Nd2Fe14B phase without any -Fe phase.
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