|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Effect of Phase Transformation on High Temperature Dynamic Flow Stresses of CP-Ti
||Sindhura Gangireddy, Steven Mates
|On-Site Speaker (Planned)
The dynamic mechanical flow stresses of titanium alloys at high temperatures can be strongly affected by phase transformation. We investigated the commercial alloy CP-Ti at temperatures upto 1200 °C, at strain rates between 1800 and 3500 1/s. Our low temperature data showed good agreement with literature limited to 750 °C, including the well-known dynamic strain aging behavior around 250 °C, where the thermal softening behavior is milder and the characteristic spike in the work hardening of flow stresses. At very high temperatures, we discover a noticeable shift coinciding with the allotropic transition point at around 880 °C, including both a sharp drop in the flow stresses at the transition point and slower rate of thermal softening distinctly different from prior transition point. We incorporate this effect of phase transformation into a constitutive material model for high temperature dynamic response.
||Planned: Supplemental Proceedings volume