Interaction of O, N, C and H interstitials with screw dislocations in hexagonal titanium

Interaction of interstitial elements and screw dislocations in hexagonal titanium is determined with ab initio calculations. O, N and C are repulsive obstacles while H exhibits attraction to dislocation, especially to pyramidal stacking faults forming the dislocation core. Studied solutes thus provoke different strengthening mechanism, i.e. dislocation cross slip or binding.

Automated summary

The interaction between interstitial elements and screw dislocations in hexagonal titanium has been determined using ab initio calculations. O, N, and C act as repulsive obstacles, while H is attracted to the dislocation, especially to the pyramidal stacking faults forming the dislocation core. Thus, the studied solutes provoke different strengthening mechanisms, such as dislocation cross-slip or binding.