Abstract
Transition metal and rare earth diffusion coefficients at 1323 K in Dy 2− y Nd y (Fe 1− x Co x ) 14B were determined by field emission energy dispersive spectroscopy compositional analysis of diffusion couple specimens. Various arrangements of component materials and temperatures were examined in order to understand the mechanisms affecting diffusion of the components and to predict the stability of functionally graded microstructures consisting of a dysprosium-rich (Dy 2− y Nd y (Fe 1− x Co x ) 14B) outer layer and a neodymium-rich (Nd 2(Fe 1− x Co x ) 14B) interior. Estimates of the mutual interdiffusion coefficients of Dy, Nd, Fe, and Co in this system were obtained from the preparation of arc melted and annealed polycrystalline specimens, assuming that the diffusion coefficients were independent of concentration (Grube solution). Fifteen diffusion couples were prepared and heat treated at 1323 K for various times in order to provide data for calculation of the diffusion coefficients. The results indicate that the diffusion coefficients of Fe and Co ( D Fe=3.28×10 −10 cm 2/s and D Co=7.63×10 −10 cm 2/s) were significantly higher at 1323 K in this system than those for Dy and Nd ( D Nd=2.3×10 −12 cm 2/s and D Dy=2.9×10 −12 cm 2/s).
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