Kinetics of low-temperature ductility in nanocrystalline titanium
R.V. Smolianets and V.A. Moskalenko
. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
Received March 23, 2019, published online April 24, 2020
The temperature dependencies of the yield strength, strainrate sensitivity of deformation stress and activation volume of plastic deformation process have been founded in the nanocrystalline titanium VT1-0 at quasi-static deformation tension in the temperature interval 4.2–395 K. The thermoactivation analysis of experimental results was performed. It is shown that the low-temperature plasticity of the nanocrystalline titanium is controlled by thermally activated dislocation overcoming of the local barriers produced by impurity interstitial atoms (oxygen, nitrogen). The empirical values of the dislocation-impurity interaction theoretical parameters were found.
Key words: nanocrystalline titanium VT1-0, thermoactivation analysis.