In situ and tomographic analysis of dislocation/grain boundary interactions in α-titanium

Abstract

In situ straining in the transmission electron microscope and diffraction-contrast electron tomography have been applied to the investigation of dislocation/grain boundary and dislocation/twin boundary interactions in α-Ti. It was found that, similar to FCC materials, the transfer of dislocations across grain boundaries is governed primarily by the minimization of the magnitude of the Burgers vector of the residual grain boundary dislocation. That is, grain boundary strain energy density minimization determines the selection of the emitted slip system.

Keywords:

• tomography
• titanium
• grain boundaries
• dislocation interactions
• in situ electron microscopy

Acknowledgements

The microscopy was carried out in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois.