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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Low-cost Titanium: 'Affordable Ti'
Presentation Title A Systematic Experimental Investigation of the Planar-to-wavy Slip Transition in Model Ti-O Alloys
Author(s) Yan Chong, Ruopeng Zhang, Shiteng Zhao, Mark Asta, Daryl Chrzan, Andrew Minor
On-Site Speaker (Planned) Yan Chong
Abstract Scope Oxygen can significantly increase the strength of titanium, but also cause planar slip dominant dislocation activity leading to limited work-hardening ability and a loss of ductility. In this study, we proposed a model in which the interstitial oxygen shuffling by screw dislocations and its subsequent reversal determines whether the planar or wavy slip is dominant during tensile deformation. We use tensile deformation at low, room and high temperatures at various strain rates and subsequent microstructural analysis by TEM to experimentally map out the effect of oxygen content, temperature and strain rate on the planar to wavy slip transition in Ti-O model alloys. Our experiments show that not only is planar slip strain rate and temperature dependent, but also effected by the oxygen concentration. We discussed these results in terms of the critical strain rate/temperature for the transition from planar to wavy slip and a proposed theoretical model for this behavior.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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