Diffusion of Cobalt in Single Crystal α-Titanium

Abstract

Diffusion coefficients of 60Co in single crystal α-Ti have been measured over the temperature range from 871 K to 1135 K. It has been confirmed that cobalt exhibits extremely fast diffusion about five orders of magnitude faster than the self-diffusion in α-Ti. The temperature dependence of the 60Co diffusivities parallel and perpendicular to the c axis is expressed asD⁄⁄=1.9×10−6exp{−(114.1±0.9)kJ·mol−1⁄RT}m2s−1,D⊥=3.2×10−6exp{−(126.1±1.2)kJ·mol−1⁄RT}m2s−1.It is suggested that some interstitial-type mechanism is operative in the Co diffusion in α-Ti.