Solute and solvent diffusion in V-Zr alloys

Abstract

Abstract Solute (95Zr) and solvent (48V) diffusion in V-Zr alloys have been studied as a function of solute content (Zr ∼0–2 at.%) and temperature (1578–1883 K for solute diffusion and 1578–1888 K for solvent diffusion). With increasing solute content, diffusion parameters D o and Q for the solute (95Zr) are found to increase from 8·1 to 24·2 × 10−3m2s−1 and 369·2 to 380·8 kJ mol−1 respectively, while for solvent (48V) diffusion they are found to decrease from 11·8 to 5·8 × 10−3m2s−1 and 389·3 to 3730 kJ mol−1, respectively. Calculations of certain jump frequency ratios and the impurity correlation factor f 1, with and without a weak perturbation approximation, agree well for weak solute vacancy interaction. The results are consistent with a vacancy mechanism of diffusion.