Measuring the dislocation density of VT1-0 titanium alloys with different content of hydrogen by x-ray diffraction method

In this study, the distributions of dislocation density with hydrogen concentration in titanium VT1-0 were obtained. The samples with different hydrogen concentrations was carried out by using the Sieverts method. The dislocation densities were obtained by using the full width at height medium calculations from the XRD results of Gaussian approximation fitting. For accurate calculation of the dislocation density in titanium alloys, the double-line separation phenomenon of the XRD results and the variation of the Burgers vector in different lattice directions were considered. The phenomenon of the double-line separation is more evident when the diffraction angle 2θ is larger than 40°. The mean value of dislocation density for the different hydrogen concentrations is about 10¹³ ∼ 10¹⁴ m^-2. Moreover, as the increases of hydrogen content in the titanium alloy, the dislocation density also increases.