|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||In Situ Study of Oxygen’s Influence on Deformation Twinning in Alpha-Titanium
||Rachel Traylor, Josh Kacher, Max Poschmann, Mark D. Asta, Daryl C. Chrzan, Andrew M. Minor
|On-Site Speaker (Planned)
It has been recently reported that the strong repulsive interaction between individual oxygen interstitials and a-type screw dislocations is the primary mechanism responsible for the pronounced strengthening effect observed in alpha-Ti with small increases in oxygen content [Q. Yu, L. Qi, et al., Science, 2015]. Additionally, it is well known that oxygen suppresses deformation twinning nucleation and growth, although the mechanisms responsible are less understood since there is still some controversy as to whether dislocation slip is a prerequisite for HCP deformation twinning. To systematically study these effects, we employ advanced transmission electron microscopy techniques, including high-resolution strain mapping and HRSTEM as well as in situ SEM and TEM nanomechanical testing and EBSD, on preferentially oriented high purity alpha-Ti samples with varying oxygen contents. These findings, combined with first-principles studies, will shed new light on the fundamental influence of oxygen on the mechanical performance of HCP metals.
||Planned: A print-only volume