Gorsky effect and diffusion of carbon in grade VT1-0 titanium

It was shown by transmission electron microscopy that precipitates of a car bon-based metastable phase coherently bound with the matrix are present in grade VT1-0 titanium. In a temperature range of 300-550 degreesC, in bendin g tests using a three-point scheme, the Gorsky effect for carbon is observe d, which is revealed in the reversible creep deformation. A technique is su bstantiated that permits one to determine the coefficient of diffusion of i nterstitial impurities that cause the Gorsky effect. Using this technique, effective coefficients of carbon diffusion in a temperature range of 300-55 0 degreesC were determined in VT1-0 titanium samples with various grain siz es. It is shown that in the fine-grained state (grain size of about 0.3 mum ). the main mechanism of carbon diffusion is grain-boundary diffusion. Acti vation energies are determined for grain-boundary and bulk diffusion of car bon (103 and 177 kJ/mol, respectively).