Time dependence and other effects on the tracer diffusion of 113Sn in titanium

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Abstract
The tracer diffusion of 113Sn in α- and β-titanium has been investigated using grinding and lathe sectioning techniques. The diffusion coefficient obtained in β-titanium in the first 200°c above the phase change has been found to be dependent on diffusion anneal time. In α-titanium there is an indication of dependence of the diffusion coefficient on pre-diffusion heat treatment. It is suggested that these results indicate the formation of a large number of defects during the β-α phase change following grain growth. In β-titanium these defects must anneal rapidly but leave a high equilibrium (or pseudo-equilibrium) value of D. The penetration plots obtained for diffusion in α-titanium consisted of two straight line regions. The initial steep slope is shown not to be due to surface effects. Two possible mechanisms considered are (a) the existence of a large-scale α-β structure, and (b) anisotropic diffusion in α grains of two preferred orientations.

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