| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Anomalous c+a Dislocation Activity in TIMETAL-407 (Ti-407) |
| Author(s) |
Zachary T. Kloenne, Gopal Viswanathan , Bo Pang, Stephen Fox, Michael Loretto, Hamish L 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-0.85Al-3.9V-0.25Si-0.25Fe-0.15O (wt.%, Ti-407) was studied and compared with Ti-6Al-4V (wt.%). Whilst Ti-64 was shown to deform by c+a dislocations only in hard grains, Ti-407 exhibited c+a activity in both hard and soft grains. Initial CRSS measurements show a similar trend in Ti-407 as Ti-64. Preliminary atomic resolution imaging of Ti-407 shows a deviation in the ideal interface structure. A combination of CTEM, aberration corrected HRSTEM, and additional micropillar testing was performed to elucidate the source of anomalous c+a dislocation activity in Ti-407. |
| Proceedings Inclusion? |
Planned: |