About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Titanium Technology
|
Presentation Title |
Role of Defects in Alpha Precipitation in Metastable Beta Ti-5Al-5Mo-5V-3Cr Alloy |
Author(s) |
Dian Li, Wenrui Zhao, Stoichko Antonov, Yufeng Zheng |
On-Site Speaker (Planned) |
Yufeng Zheng |
Abstract Scope |
The mechanical performance of beta titanium alloys can be optimized by tuning hcp structured alpha precipitates in a matrix of bcc beta phase. Our previous study in Ti-5Al-5Mo-5V-3Cr (wt%, Ti-5553) has shown that fine-scale alpha microstructure can be generated, in which the pre-formed omega/beta interface may act as favorable nucleation sites for alpha precipitation. In this work, the role of other defects including dual-phase interface, twin boundary and grain boundary in tuning alpha precipitation in the metastable beta Ti-5553 alloy is studied using SEM, TEM, APT and FIB-SEM tomography. Fine-scale alpha precipitates form from pre-formed O”/beta interface; coarse alpha precipitates form along pre-formed twin boundary; while thick alpha layer forms from the grain boundary alpha. The possible microstructure evolution pathway to generate hierarchical alpha microstructure in Ti-5553 will be introduced. |
Proceedings Inclusion? |
Planned: |
Keywords |
Titanium, Phase Transformations, Characterization |