| About this Abstract |
| Meeting |
2010 TMS Annual Meeting & Exhibition
|
| Symposium
|
General Abstracts: Structural Materials Division
|
| Presentation Title |
Nucleation of Extension Deformation Twins in α-Ti |
| Author(s) |
Leyun Wang, Yiyi Yang, Martin Crimp, Philip Eisenlohr, Darren Mason, Thomas Bieler |
| On-Site Speaker (Planned) |
Leyun Wang |
| Abstract Scope |
Activity of two extension twinning systems, {10-12}<-1011>(T1) and {11-21}<-1-126}(T2), is observed in textured polycrystalline α-Ti. The crystallographic direction of hexagonal c-axes was preferentially aligned with the global tensile direction resulting from 4-point bending. Hence, most grains are in a hard orientation with low Schmid factors for basal and prismatic slip. T1 twinning was observed much more frequently than T2 twinning. The statistically significant correlation of the alignment between T1 twins and active prismatic slip systems, or, alternatively, other T1 twins, in neighboring grains indicates that nucleation of these twins follows from strain compatibility constraints at grain boundaries. Formation of T2 twins is found to require not only high Schmid factors, but is additionally limited to conglomerates of hard-oriented grains. This preferential activation in hard clusters will be discussed. Support was provided by NSF grant DMR-0710570 and DFG grant EI 681/2-1. |
| Proceedings Inclusion? |
Definite: A CD-only volume |