|About this Abstract
||Materials Science & Technology 2019
||Ultra High Performance Metallic Systems for Aerospace, Defense, and Automotive Applications
||Evolution in Mechanical Response, Phase Transformation and Texture of Titanium Aluminide processed by High-Pressure Torsion
||Jae-Kyung Han, Xi Li, Rian Dippenaar, Klaus-Dieter Liss, Megumi Kawasaki
|On-Site Speaker (Planned)
Processing of an ultrafine-grained γ-based Ti-45Al-7.5Nb intermetallic compound was conducted at room temperature by high-pressure torsion (HPT) through 10 turns under a compressive pressure of 6.0 GPa. Successful grain refinement was introduced into a thin, 10 mm diameter disk containing a duplex microstructure by attaining ultrafine laths with thicknesses of 40-100 nm after 10 HPT turns. Micro-mechanical response was examined by a novel nanoindentation technique. The occurrence of phase transformations and order-disorder phase transitions were detected by lab-scale X-ray diffraction and neutron diffraction analyses 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 surfaces to the core 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.
||Definite: At-meeting proceedings