Imperial College London
Alternate

ProfessorFionnDunne

Faculty of Engineering, Department of Materials

Principal Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 2884fionn.dunne

 
 
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Location

 

104Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zheng:2017:10.1016/j.actamat.2017.01.021,
author = {Zheng, Z and Balint, D and Dunne, F},
doi = {10.1016/j.actamat.2017.01.021},
journal = {Acta Materialia},
pages = {43--53},
title = {Investigation of slip transfer across HCP grain boundaries with application to cold dwell facet fatigue},
url = {http://dx.doi.org/10.1016/j.actamat.2017.01.021},
volume = {127},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper addresses the role of grain boundary slip transfer and thermally-activated discretedislocation plasticity in the redistribution of grain boundary stresses during cold dwell fatigue intitanium alloys. Atomistic simulations have been utilised to calculate the grain boundary energies fortitanium with respect to the misorientation angles. The grain boundary energies are utilised within athermally-activated discrete dislocation plasticity model incorporating slip transfer controlled byenergetic and grain boundary geometrical criteria. The model predicts the grain size effect on the flowstrength in Ti alloys. Cold dwell fatigue behaviour in Ti-6242 alloy is investigated and it is shown thatsignificant stress redistribution from soft to hard grains occurs during the stress dwell, which isobserved both for grain boundaries for which slip transfer is permitted and inhibited. However, thegrain boundary slip penetration is shown to lead to significantly higher hard-grain basal stresses nearthe grain boundary after dwell, thus exacerbating the load shedding stress compared to animpenetrable grain boundary. The key property controlling the dwell fatigue response is argued toremain the time constant associated with the thermal activation process for dislocation escape, but theslip penetrability is also important and exacerbates the load shedding. The inclusion of a macrozonedoes not significantly change the conclusions but does potentially lead to the possibility of a largerinitial facet.
AU  - Zheng,Z
AU  - Balint,D
AU  - Dunne,F
DO  - 10.1016/j.actamat.2017.01.021
EP  - 53
PY  - 2017///
SN  - 1359-6454
SP  - 43
TI  - Investigation of slip transfer across HCP grain boundaries with application to cold dwell facet fatigue
T2  - Acta Materialia
UR  - http://dx.doi.org/10.1016/j.actamat.2017.01.021
UR  - http://hdl.handle.net/10044/1/43886
VL  - 127
ER  -
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