Anomalous growth of dislocation density in titanium during recovery

Abstract

It is generally believed that the dislocation density in cold-worked metals decreases during recovery. In this study, we used in-situ synchrotron X-ray diffraction (SXRD) to demonstrate that the dislocation density in -titanium increases at the initial stages of heating. This phenomenon was clearly reproduced by classical molecular dynamics (MD) simulation. It was concluded, that under conditions of low dislocation mobility, the generation of new dislocations can reduce the overall level of stresses and potential energy during heating of the deformed material. The paper describes the dynamics of dislocations, as well as the dislocation reactions at different stages of heating of a cold-worked titanium sample.