Imperial College London
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DrZhushengShi

Faculty of Engineering, Department of Mechanical Engineering

Advanced Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 1806zhusheng.shi

 
 
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Location

 

705City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@inproceedings{Jiang:2022:10.4028/p-tunvtz,
author = {Jiang, S and Yardley, VA and Li, N and Gu, B and Li, YB and Liu, YQ and Shi, Z},
doi = {10.4028/p-tunvtz},
pages = {109--116},
publisher = {Trans Tech Publications, Ltd.},
title = {Revealing the Geometrically Necessary Dislocation Density Evolution during Hot Compression of AA7050},
url = {http://dx.doi.org/10.4028/p-tunvtz},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - <jats:p>Dislocations play a critical role in metal forming processes, and accurate values of dislocation density are important in modelling these processes. However, direct determination of the dislocation density is challenging. In this study, electron backscatter diffraction is used to estimate the evolution of geometrically necessary dislocation density as a function of plastic strain, strain rate and temperature in hot compression of AA7050 alloy. The geometrically necessary dislocation density was found to increase at a higher strain rate and lower temperature; the higher dislocation density in these samples promoted continuous dynamic recrystallisation leading to grain refinement. At lower strain rates and higher temperatures, the dislocation densities were lower and dislocations formed into walls, channels and cells. These observations agree with accepted theories of dislocation evolution and demonstrate the capability of electron backscatter diffraction to provide representative dislocation density values as well as comprehensive information linking plastic flow with microstructural evolution.Keywords: electron backscatter diffraction (EBSD), geometrically necessary dislocations (GNDs), hot deformation, AA7050</jats:p>
AU  - Jiang,S
AU  - Yardley,VA
AU  - Li,N
AU  - Gu,B
AU  - Li,YB
AU  - Liu,YQ
AU  - Shi,Z
DO  - 10.4028/p-tunvtz
EP  - 116
PB  - Trans Tech Publications, Ltd.
PY  - 2022///
SP  - 109
TI  - Revealing the Geometrically Necessary Dislocation Density Evolution during Hot Compression of AA7050
UR  - http://dx.doi.org/10.4028/p-tunvtz
ER  -
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