2014/03/12 by Maryam Ghazisaeidi, M. Ghazisaeidi, Ghazisaeidi, M. +3
Materials Science · Physics and Astronomy · #Fusion materials and technologies #Microstructure and mechanical properties #Titanium Alloys Microstructure and Properties #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1403.2806
arxiv created 2014/03/12 · arxiv updated 2014/03/13
Oxygen greatly affects the mechanical properties of titanium. In addition, dislocations and twin boundaries influence the plastics deformation of hcp metals. As part of a systematic study of defects interactions in Ti, we investigate the interactions of oxygen with (10-12) twin boundary and (10-10) prism plane stacking fault. The energetics of four interstitial sites in the twin geometry are compared with the bulk octahedral site. We show that two of these sites located at the twin boundary are more attractive to oxygen than bulk while the sites away from the boundary are repulsive. Moreover, we study the interaction of oxygen with the prismatic stacking fault to approximate oxygen-dislocation interaction. We show that oxygen increases the stacking fault energy and therefore is repelled by the faulted geometry and consequently a dislocation core.