Abstract
Measurements of the Curie and spin reorientation temperatures provide information about elemental partitioning as a function of effective quench rate in Nd 2Fe 14B-based powders modified by alloying additions, including Ti and C. The Curie and spin reorientation temperatures of inert gas-atomized (IGA) powders of various size fractions and annealing conditions were measured using differential thermal analysis (DTA) and SQUID AC magnetometry. The Curie temperatures of all size fractions of the Ti/C-containing powders are lower for both the as-quenched and annealed portions than those of the Ti/C-free powders. The spin reorientation temperatures of the Ti/C-modified material are found to be significantly lower than that expected for pure Nd 2Fe 14B. The data suggest that the alloying additions reside in the Nd 2Fe 14B lattice to varying degrees, dependent upon the quench rate experienced by the particle, and are expelled from the compound to the grain boundaries upon extended annealing.
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