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Metastable solidification of NdFeB alloys by drop-tube processing

Metastable solidification of small droplets of Nd 11.8 Fe 82.3 B 5.9 and Nd 14 Fe 79 B 7 alloys was performed in an 8-m drop tube filled with helium. The results showed that the solidification path of the droplets depends on the alloy composition and on the droplet size. For Nd 11.8 Fe 82.3 B 5.9 alloy, larger droplets are solidified by primary iron formation and subsequent Nd 2 Fe 14 B crystallization from the residual liquid phase, whereas smaller ones tend to be frozen by metastable primary Nd 2 Fe 17 B x growth ( x = 0–1). A similar transition of the solidification path from primary iron formation to primary Nd 2 Fe 17 B x formation occurred in Nd1 4 Fe 79 B 7 alloy with reducing droplet size. However, metastable primary growth of Nd 2 Fe 14 B was also observed within a wide droplet size range prior to the appearance of the metastable Nd 2 Fe 17 B x phase. Nucleation and growth of different phases were considered to produce an explanation of the observed phase selection phenomena in these two alloys.