Abstract
This paper investigates the role of beta phase on the micro-mechanical behaviour of dual-phase titanium alloys, with particular emphasis on the phenomenon of cold dwell fatigue, which occurs in such alloys under room temperature conditions. A strain gradient crystal plasticity model is developed and calibrated against micro-pillar compression test data for a dual-phase alpha-beta specimen. The effects of key microstructural variables, such as relative beta lath orientation, on the micromechanical response of idealised alpha-beta colony microstructures are shown to be consistent with previously-published test data. A polycrystal study on the effects of the calibrated alpha-beta crystal plasticity model on the local micromechanical variables controlling cold dwell fatigue is presented. The presence of the alpha-beta phase is predicted to increase dwell fatigue resistance compared to a pure alpha phase microstructure. (C) 2017 Elsevier Ltd. All rights reserved.
| Original language | English (Ireland) |
|---|---|
| Number of pages | 11 |
| Journal | International Journal of Fatigue |
| Volume | 100 |
| DOIs | |
| Publication status | Published - 1 Jul 2017 |
Authors (Note for portal: view the doc link for the full list of authors)
- Authors
- Ashton, PJ,Jun, TS,Zhang, Z,Britton, TB,Harte, AM,Leen, SB,Dunne, FPE