| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
N-29: Evolution in Mechanical Response, Phase Transformation and Texture of Titanium Aluminide Processed by High-pressure Torsion |
| Author(s) |
Jae-Kyung Han, Xi Li, Rian Dippenaar, Klaus-Dieter Liss, Megumi Kawasaki |
| On-Site Speaker (Planned) |
Jae-Kyung Han |
| Abstract Scope |
Processing of an ultrafine-grained γ-based Ti-45Al-7.5Nb intermetallic compound was conducted by high-pressure torsion (HPT) up to 10 turns under 6.0 GPa at room temperature. Severe grain refinement was introduced into a 10 mm diameter disk containing a duplex microstructure by producing ultrafine laths with thicknesses of 40-100 nm after 10 turns by HPT. Micro-mechanical responses were examined by a novel nanoindentation technique. The occurrence of phase transformations and order-disorder phase transitions were confirmed by complementary analyses using lab-scale X-ray diffraction and neutron diffraction at different through-thickness sections within the processed samples. Close scrutiny revealed that the phase transformations and order/disorder phase transitions vary gradually from the sample core to the surface and hence, a significant heterogeneous texture develops as a result of HPT processing. This study demonstrates considerable potential for utilizing HPT processing for achieving enhanced microstructural development, improved mechanical properties and control of texture in Titanium Aluminides. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |