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{Chen:2019:10.1016/j.ijplas.2019.04.012,
author = {Chen, L and James, Edwards TE and Di, Gioacchino F and Clegg, WJ and Dunne, FPE and Pham, M-S},
doi = {10.1016/j.ijplas.2019.04.012},
journal = {International Journal of Plasticity},
pages = {344--360},
title = {Crystal plasticity analysis of deformation anisotropy of lamellar TiAl alloy: 3D microstructure-based modelling and in-situ micro-compression},
url = {http://dx.doi.org/10.1016/j.ijplas.2019.04.012},
volume = {119},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Detailed microstructure characterisation and in-situ micropillar compression were coupled with crystal plasticity-based finite element modelling (CP-FEM) to study the micro-mechanisms of plastic anisotropy in lamellar TiAl alloys. The consideration of microstructure in both simulation and in-situ experiments enables in-depth understanding of micro-mechanisms responsible for the highly anisotropic deformation response of TiAl on the intra-lamella and inter-lamella scales. This study focuses on two specific configurations of  lamellar microstructure with the  interfaces being aligned  and  to the loading direction. Microstructure-based CP-FEM shows that longituginal slip of super and ordinary dislocations are most responsible for the plastic anisotropy in the micropillar while the anisotropy of the  micropillar is due to longitudinal superdislocations and longitudinal twins. In addition, transversal superdislocations were more active, making the deformation in the  micropillar less localised than that in the  micropillar. Moreover, the CP-FEM model successfully predicted substantial build-up of internal stresses at  interfaces, which is believed to be detrimental to the ductility in TiAl. However, as evidenced by the model, the detrimental internal stresses can be significantly relieved by the activation of transverse deformation twinning, suggesting that the ductility of TiAl can be improved by promoting transverse twins.
AU  - Chen,L
AU  - James,Edwards TE
AU  - Di,Gioacchino F
AU  - Clegg,WJ
AU  - Dunne,FPE
AU  - Pham,M-S
DO  - 10.1016/j.ijplas.2019.04.012
EP  - 360
PY  - 2019///
SN  - 0749-6419
SP  - 344
TI  - Crystal plasticity analysis of deformation anisotropy of lamellar TiAl alloy: 3D microstructure-based modelling and in-situ micro-compression
T2  - International Journal of Plasticity
UR  - http://dx.doi.org/10.1016/j.ijplas.2019.04.012
UR  - https://www.sciencedirect.com/science/article/pii/S0749641919300026
UR  - http://hdl.handle.net/10044/1/69190
VL  - 119
ER  -
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