About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Nanostructure-mediated Phase Transformation and Deformation in Metastable Beta Titanium Alloys |
| Author(s) |
Deepak Pillai, Stoichko Antonov, Hamish Fraser, Yufeng Zheng |
| On-Site Speaker (Planned) |
Yufeng Zheng |
| Abstract Scope |
Lightweight metastable beta titanium alloys are of great interest in the aerospace industry due to their high strength, low density, and excellent toughness. Various nanostructures can form in these alloys during thermal and mechanical treatments, impacting their microstructure evolution and mechanical behavior. In this presentation, we will introduce recent studies of nanostructures in metastable beta titanium alloys using advanced TEM techniques. In a metastable Ti-5Al-5Mo-5V-3Cr alloy, we first identified a novel ordered orthorhombic O” phase. By combining aberration-corrected STEM (ACSTEM) and 3D atom probe tomography, we demonstrate that the nanoscale Al-rich O” phase could promote fine-scale alpha precipitation. In a cold-rolled metastable beta Ti-24Nb-4Zr-8Sn alloy, we reveal the nanoscale omega phase and alpha” phase at the deformation twin boundaries using diffraction contrast TEM and ACSTEM. Our studies provide new insights into the nanostructure-mediated microstructure evolution and deformation behavior in metastable beta titanium alloys, supporting future alloy design through microstructure engineering. |