Abstract
A dynamical diffusion model is presented that is able to describe the parabolic and cubic behavior of the pre-transition oxidation kinetics of polycrystalline zirconium in dry oxygen during isothermal oxidation treatments at 573 and 623 K. The model considers that the processes of crystallization and grain growth during oxidation modify the oxygen diffusion coefficient, by decreasing the number of short circuit paths in the oxide. The change of the oxygen diffusion coefficient is related with the “time at temperature” of each oxide layer formed at the oxide/metal interphase boundary.
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