|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Development of Various Scale Alpha Microstructures in Titanium Alloys
||Yufeng Zheng, Robert E.A. Williams, Rongpei Shi, Deep Choudhuri, Talukder Alam, Rajarshi Banerjee, Yunzhi Wang, Hamish L. Fraser
|On-Site Speaker (Planned)
Beta titanium alloys have attracted considerable attentions due to its refined nature of microstructure manipulated by various thermal/mechanical processes. In our recent study, alpha microstructures of different size scales have been produced in Ti-5Al-5Mo-5V-3Cr (Ti-5553), namely refined, more-refined and super-refined alpha microstructures, by applying various heat treatments, upon the different influences from pre-formed omega phase. The nucleation and growth mechanism of omega phase was firstly studied using high resolution scanning transmission electron microscopy and three-dimension atom probe. Then coupling with phase field modeling, it has been shown that pre-formed omega phase particle can alter the local structure and concentration and therefore provide extra driving force for subsequent alpha precipitation. Specific designed heat treatment can effectively select such extra driving force and therefore produce different fine scale alpha microstructure. Therefore, a thorough understanding of omega phase and its influence on non-transformation pathways controlling alpha microstructures in titanium alloys will be introduced.
||Planned: Supplemental Proceedings volume