| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Alloy Microstructure Science and Engineering
|
| Presentation Title |
A Novel Growth Mechanism of the Alpha Phase in Titanium Alloys |
| Author(s) |
Rongpei Shi, Deep Choudhuri, Ankush Kashiwar, Sriswaroop Dasari, Yunzhi Wang, Rajarshi Banerjee, Dipankar Banerjee |
| On-Site Speaker (Planned) |
Dipankar Banerjee |
| Abstract Scope |
Alpha morphology and distribution in titanium alloys can be categorised into colony-dominated microstructures originating from grain boundary alpha allotriomorphs, bundles of intragranular alpha laths, and homogeneously distributed individual fine-scale α laths. Branching of the α precipitates was observed in all these domains in a manner associated with solid-state dendritic growth. 3-dimensional features of such branched structures have been characterized. Simulation of the branching process by phase field methods incorporating anisotropy in the alpha/beta interface energy and elasticity suggests that it can be initiated at growth ledges present at broad faces of the alpha laths, driven by the enhancement of the diffusion flux at these steps. The dependence of branching on various parameters such as supersaturation and diffusivity, and microstructural features such as ledge height and distribution and the presence of adjacent alpha variants has been evaluated. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Phase Transformations, Computational Materials Science & Engineering |