Imperial College London
Portrait Picture

Dr T Ben Britton

Faculty of Engineering, Department of Materials

Visiting Reader
 
 
 
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Contact

 

+44 (0)20 7594 2634b.britton Website

 
 
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Location

 

B301Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Luan:2018:10.1016/j.msea.2018.08.010,
author = {Luan, Q and Britton, TB and Jun, T},
doi = {10.1016/j.msea.2018.08.010},
journal = {Materials Science and Engineering: A},
pages = {385--397},
title = {Strain rate sensitivity in commercial pure titanium: the competition between slip and deformation twinning},
url = {http://dx.doi.org/10.1016/j.msea.2018.08.010},
volume = {734},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Titanium alloys are widely used in light weight applications such as jet engine fans, where their mechanical performance under a range of loading regimes is important. Titanium alloys are mechanically anisotropic with respect to crystallographic orientation, and remarkably titanium creeps at room temperature. This means that the strain rate sensitivity (SRS) and stress relaxation performance are critical in predicting component life. In this work, we focus on systematically exploring the macroscopic SRS of Grade 1 commercially pure titanium (CP Ti) with varying grain sizes and texture using uniaxial compression. Briefly, we find that Ti samples had positive SRS and samples compressed along the sheet rolling direction (RD) (i.e. soft grains dominant) were less rate sensitive than bars compressed along the sheet normal direction (ND) (i.e. hard grains dominant). We attribute this rate sensitivity to the relative activity of slip and twinning. Within the grain size range of ~ 317 ±7 μm, we observe an increase in the rate sensitivity, where volume fraction of {101 2}<101 1> T1 tensile twins was low, and the twin width at different strain rates were similar. These observations imply that the macroscopic rate sensitivity is controlled by the ensemble behaviour of local deformation processes: the amount of slips accumulated at grain boundaries affects the SRS, which is grain size and texture dependent. We hope that this experimental study motivates mechanistic modelling studies using crystal plasticity, including strain rate sensitivity and twinning, to predict the performance of titanium alloys.
AU  - Luan,Q
AU  - Britton,TB
AU  - Jun,T
DO  - 10.1016/j.msea.2018.08.010
EP  - 397
PY  - 2018///
SN  - 0921-5093
SP  - 385
TI  - Strain rate sensitivity in commercial pure titanium: the competition between slip and deformation twinning
T2  - Materials Science and Engineering: A
UR  - http://dx.doi.org/10.1016/j.msea.2018.08.010
UR  - http://hdl.handle.net/10044/1/63251
VL  - 734
ER  -
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