Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion

Eggersmann M, Ye F, Herth S, Gutfleisch O, Wurschum R (2001)
Interface Science 9(3/4): 337-341.

Journal Article | Published | English

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Abstract
Grain-boundary (Gb) diffusion was studied in ultrafine grained Nd2Fe14B-based permanent magnets below and above the melting transition of the Nd-enriched intergranular phase using the radiotracer technique with the isotope Fe-59. The product deltaD(Gb) of interface diffusion coefficient and interface thickness shows a substantial increase above the intergranular melting transition. Assuming a volume self-diffusivity as in alpha-Fe, an analysis in the framework of grain-boundary diffusion kinetic of type B yields an Arrhenius-type behaviour deltaD(Gb) = 1.53 x 10(-11) exp(-1.74 eV/kT) m(3) s(-1) below the intergranular melting transition. Similar values deltaD(Gb) are observed for ultrafine grained Nd-Fe-B with reduced Nd excess in the grain boundaries. The diffusion characteristics are compared with the kinetics of the hot-deformation which is of technical relevance for the processing of high-performance permanent magnets.
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Eggersmann M, Ye F, Herth S, Gutfleisch O, Wurschum R. Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion. Interface Science. 2001;9(3/4):337-341.
Eggersmann, M., Ye, F., Herth, S., Gutfleisch, O., & Wurschum, R. (2001). Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion. Interface Science, 9(3/4), 337-341.
Eggersmann, M., Ye, F., Herth, S., Gutfleisch, O., and Wurschum, R. (2001). Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion. Interface Science 9, 337-341.
Eggersmann, M., et al., 2001. Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion. Interface Science, 9(3/4), p 337-341.
M. Eggersmann, et al., “Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion”, Interface Science, vol. 9, 2001, pp. 337-341.
Eggersmann, M., Ye, F., Herth, S., Gutfleisch, O., Wurschum, R.: Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion. Interface Science. 9, 337-341 (2001).
Eggersmann, M, Ye, F, Herth, Simone, Gutfleisch, O, and Wurschum, R. “Intergranular melting of ultrafine grained Nd2Fe14B studied by means of radiotracer diffusion”. Interface Science 9.3/4 (2001): 337-341.
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