Imperial College London
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DrAlexanderKnowles

Faculty of Engineering, Department of Materials

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a.knowles

 
 
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Location

 

B301Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Gao:2018:10.1016/j.actamat.2018.04.035,
author = {Gao, J and Huang, Y and Guan, D and Knowles, AJ and Ma, L and Dye, D and Rainforth, WM},
doi = {10.1016/j.actamat.2018.04.035},
journal = {Acta Materialia},
pages = {301--314},
title = {Deformation mechanisms in a metastable beta titanium twinning induced plasticity alloy with high yield strength and high strain hardening rate},
url = {http://dx.doi.org/10.1016/j.actamat.2018.04.035},
volume = {152},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Metastable β titanium alloys with both twinning (TWIP) and martensite transformation (TRIP)usually exhibit a low yield strength of between 200 and 500MPa, but high strain hardening rateand large uniform elongation. Alloys that exhibit twinning on a single system provide a higheryield strength, but a lower strain hardening rate. Here, for the first time, we report a new alloy(Ti-7Mo-3Cr wt%) with both high yield strength (695 MPa) and high work hardening rate(~1900 MPa) and a substantial 33.3% uniform elongation. The deformation mechanisms weresystematically investigated using EBSD and TEM for samples strained to 1.3%, 5% and 16%.The high yield strength was achieved through initial deformation mechanisms of two twinsystems, namely both {332}<113> and {112}<111> twinning. Importantly, the martensitetransformation was suppressed at this stage of deformation. The combination of two twinsystems, with approximately the same intensity, resulted in a high strain hardening rate(1600MPa to 1900MPa), much greater compared to alloys that exhibit a single twin system.Moreover, the TRIP effect was observed at strains greater than 5%, which also contributed tothe high strain hardening rate large uniform elongation.
AU  - Gao,J
AU  - Huang,Y
AU  - Guan,D
AU  - Knowles,AJ
AU  - Ma,L
AU  - Dye,D
AU  - Rainforth,WM
DO  - 10.1016/j.actamat.2018.04.035
EP  - 314
PY  - 2018///
SN  - 1359-6454
SP  - 301
TI  - Deformation mechanisms in a metastable beta titanium twinning induced plasticity alloy with high yield strength and high strain hardening rate
T2  - Acta Materialia
UR  - http://dx.doi.org/10.1016/j.actamat.2018.04.035
UR  - http://hdl.handle.net/10044/1/59117
VL  - 152
ER  -
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