Peer-Reviewed Journal Details
Mandatory Fields
Ashton, PJ,Jun, TS,Zhang, Z,Britton, TB,Harte, AM,Leen, SB,Dunne, FPE
2017
July
International Journal Of Fatigue
The effect of the beta phase on the micromechanical response of dual-phase titanium alloys
Published
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Optional Fields
Crystal plasticity Dwell fatigue Length-scale effects Dual-phase titanium alloy STRAIN-RATE SENSITIVITY PLASTICITY FE MODEL CRYSTAL PLASTICITY DISLOCATION DENSITY DWELL-FATIGUE TI ALLOYS DEFORMATION SIZE TI-6AL-4V MECHANISMS
100
377
387
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.
10.1016/j.ijfatigue.2017.03.020
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