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

It was shown by transmission electron microscopy that precipitates of a carbon-based metastable phase coherently bound with the matrix are present in grade VT1-0 titanium. In a temperature range of 300 550°C, in bending tests using a three-point scheme, the Gorsky effect for carbon is observed, which is revealed in the reversible creep deformation. A technique is substantiated that permits one to determine the coefficient of diffusion of interstitial impurities that cause the Gorsky effect. Using this technique, effective coefficients of carbon diffusion in a temperature range of 300-550°C were determined in VT1-0 titanium samples with various grain sizes. It is shown that in the fine-grained state (grain size of about 0.3 μm), the main mechanism of carbon diffusion is grain-boundary diffusion. Activation energies are determined for grain-boundary and bulk diffusion of carbon (103 and 177 kJ/mol, respectively).