|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Investigation of Alpha/Beta Interface Structure in a Titanium Alloy Using Aberration-Corrected Scanning Transmission Electron Microscope
||Yufeng Zheng, Robert E.A. Williams, William A.T. Clark, Hamish L. Fraser
|On-Site Speaker (Planned)
The structural and chemical nature of alpha/beta interface in titanium alloys plays very important role, because it can influence microstructural evolution by acting as potential nucleation site and providing extra driving force for second phase nucleation and can also affect the deformation mechanism due to its interaction with various defects. In this current work, the crystallography and the structure of the habit plane of refined and coarse alpha precipitates in the beta matrix of Ti-5553 were studied using probe corrected scanning transmission electron microscope. In Z-contrast HAADF-HRSTEM image, for the first time, terrace and disconnection structure on the broad face of both refined and coarse alpha precipitates have been characterized, in which the lengths of terraces (or the spacing of disconnections) and the height of steps at the disconnections can be measured directly. The observations are discussed in terms of an analytical topological model.
||Planned: Supplemental Proceedings volume