ON THE INFLUENCE OF IRON ON THE ZR-ALPHA-(HCP) SELF-DIFFUSION

To interpret anomalous self-diffusion in alpha-Zr, we propose the existence of two kinds of monovacancy mechanisms. The less important one operates via free monovacancies. The other operates via monovacancies associated to interstitially dissolved iron atoms. This mechanism enhances the diffusion coefficient compared with normal diffusion in compact metals. At temperatures over 1003 K, we postulate the existence of the beta-phase. We explain how small amounts of beta-phase affect the diffusion measurements.