Self- and impurity diffusion in zirconium-manganese alloys

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Abstract Self- and impurity diffusion in Zr-Mn alloys (Mn∼0–2 at. %) have been studied using the sectioning method in the temperature range 1173–1473 K. With an increase of the Mn content in the alloys, the diffusion parameters (D 0 and Q) for 95Zr diffusion in these alloys varies from 0·31 × 10−8 to 3·36 × 10−8 m2/s and 105·25 to 125·34 KJ/mole, respectively, while for 54Mn diffusion, they vary from 5·38 × 10−7 to 0·08 × 10−7 m2/s and 140·65 to 104·62 KJ/mole. Thus the addition of manganese to zirconium results in the enhancement of self-diffusivities while retarding impurity diffusion. The impurity correlation factor calculated using Le Claire's model for body-centred-cubic crystal is 0·42. The results are consistent with a vacancy mechanism of diffusion.