Bulk self-diffusion of 44Ti was measured in α-phase single crystals, at 776 to 1132K, by using radiotracer and ion-beam sputtering sectioning. The results for diffusion perpendicular to the c-axis obeyed a straight-line Arrhenius relationship:

D (cm2/s) = 1.7 x 10-4 exp[-45.9(kcal/mol)/RT]

The self-diffusion was attributed to a vacancy mechanism, and a low vacancy migration enthalpy was related to the unusually low C66 elastic constant of α-Ti.

C.Herzig, R.Willecke, K.Vieregge: Philosophical Magazine A, 1991, 63[5], 949-58

The best linear fits to the solute diffusion data ([1204] to [1206], [1226] to [1227], [1234] to [1237]) yield:

Al: Ln[Do] = 0.46E – 31.1 (R2 = 0.998); O: Ln[Do] = 0.28E – 11.8 (R2 = 0.77);

Ti: Ln[Do] = 0.25E – 17.1 (R2 = 0.85)