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