| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
|
Processing Materials for Properties
|
| Presentation Title |
Low Stress Viscous Creep in a Ti3Al2.5V Tubing Under Internal Pressurization |
| Author(s) |
Srikant Gollapudi, Indrajit Charit, Korukonda L Murty |
| On-Site Speaker (Planned) |
Korukonda L Murty |
| Abstract Scope |
Hoop creep behavior of a thin-walled Ti3Al2.5V tubing studied under closed-end internal pressurization at low stresses of interest to in-service conditions revealed viscous creep behavior. An activation energy close to that for grain boundary diffusion suggested Coble creep mechanism commonly observed in small grain size materials. However, the predicted data were 3 orders of magnitude lower than the experimental strain-rates. The slip bands observed in TEM have a mean spacing of 250 nm and the predictions based on the Spingarn and Nix model of the climb of dislocations at the grain boundaries in the slip bands were noted to be close to the experimental results. This is the first time that the slip band model was found to be operating in the viscous creep regime and further work is needed to find this mechanism in other materials. This work is supported by the National Science Foundation grant #DMR-0412583. |
| Proceedings Inclusion? |
Definite: A CD-only volume |