Solvent and solute diffusion in b.c.c. Ti—Co and Ti—Mn alloys

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Abstract
Measurements by the sectioning method of the self-diffusion coefficient c Ti44 in β TiCo and β TiMn alloys gave the results (in units of cm2 sec−1): The self-diffusion coefficients of Co60 (at 913° and 1205°) and of Mn54 (at 898° and 1240°) were also measured in these same alloys. In pure a Ti the tracer impurity diffusion coefficients of Co60 and Mn54 were measured at 799° and 856°. The results are critically discussed. They comply only in part with common generalization about solute and solvent diffusion in alloys. The solute enhancement of Ti self-diffusion rates is less than the theoretical minimum value expected for a vacancy mechanism. The results are, however, in keeping with a mechanism of diffusion by interstitial and Miller (1969 b) type interstitial-vacancy pair migration. This same mechanism is believed to operate also in the TiMn alloys.