| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Anomalous c+a Dislocation Activity in TIMETAL-407 |
| Author(s) |
Zachary T. Kloenne, Gopal Viswanathan , Michael Loretto, Hamish Fraser |
| On-Site Speaker (Planned) |
Zachary T. Kloenne |
| Abstract Scope |
Typically, two types of Burgers vectors are possible for glissile dislocations in Ti: b = [a] and b = [c+a], with the former gliding on the prismatic, basal, or first-order pyramidal planes. Previous studies have shown a large difference in CRSS between [a] slip and [c+a] slip, with the latter only being activated with close alignment of the c-axis and tensile direction. In this study, the dislocation behavior of Ti-1Al-4V-0.25Si-0.25Fe-0.15O (wt.%, Ti-407) was studied and compared with Ti-6Al-4V (wt.%). While Ti-64 was shown to deform by [c+a] dislocations in hard grains, Ti-407 exhibited [c+a] activity in both hard and soft grains. Initial CRSS measurements (micro-compression testing) show a similar trend in Ti-407 and Ti-64. FIB foils were extracted from said micropillars and studied further. It was determined that misfit dislocations at the alpha/beta interface were responsible for anomalous [c+a] activity in Ti-407, which were studied further via CTEM and HRSTEM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, Characterization |