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

@article{Chung:2021:10.1016/j.msea.2021.141213,
author = {Chung, T-F and Yang, Y-L and Tai, C-L and Shiojiri, M and Hsiao, C-N and Tsao, C-S and Li, W-C and Shi, Z and Lin, J and Yang, J-R},
doi = {10.1016/j.msea.2021.141213},
journal = {Materials Science and Engineering: A},
pages = {1--16},
title = {HR-STEM investigation of atomic lattice defects in different types of η precipitates in creep-age forming Al-Zn-Mg-Cu aluminium alloy},
url = {http://dx.doi.org/10.1016/j.msea.2021.141213},
volume = {815},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - High-resolution (HR) high-angle annular dark-field (HAADF) scanning transmission electron microscopy (STEM) hasrevealed the atomic lattice defects in different types of η precipitates in the Al–Zn–Mg–Cu aluminium alloy subjectedto creep-age forming treatment (with a constant stress lower than its room-temperature yield strength duringageing). Along the zone axes of [110]Al//[2110]η of η1 and η12, [112]Al//[2110]η of η2 and [100]Al//[2110]η ofη13, atomic projections of (2110)η have been investigated. In those types of η, elongated hexagonal lattice defects(labelled as Type I defects) can be found; they are apparently related to local disorder in atomic stackings.Furthermore, in η12, elongated hexagonal lattice defects with a much higher aspect ratio (labelled as Type II defects)are uniquely observed. These atomic lattice defects are presumably pertinent to the lattice accommodation in thecourse of creep-age forming. Additionally, in η1 and η12, the features of a Penrose tiling defect connecting with TypeI defects are observed, and these complex defects obviously affect the growth direction of the precipitate, resulting ina nearly spherical morphology. Alternatively, several entirely-passed faulted layers in a new type of precipitate, η14,consequently bring about a new orientation relationship: (513)Al//(0001)η14 and [112]Al//[2110]η14. Moreover, inan atomic STEM image of η14, the significant Z-contrast gradient adjacent to the transformation front of η14 elucidates the Zn/Cu diffusion from the matrix to the precipitate along {111}Al planes at the interface.
AU  - Chung,T-F
AU  - Yang,Y-L
AU  - Tai,C-L
AU  - Shiojiri,M
AU  - Hsiao,C-N
AU  - Tsao,C-S
AU  - Li,W-C
AU  - Shi,Z
AU  - Lin,J
AU  - Yang,J-R
DO  - 10.1016/j.msea.2021.141213
EP  - 16
PY  - 2021///
SN  - 0921-5093
SP  - 1
TI  - HR-STEM investigation of atomic lattice defects in different types of η precipitates in creep-age forming Al-Zn-Mg-Cu aluminium alloy
T2  - Materials Science and Engineering: A
UR  - http://dx.doi.org/10.1016/j.msea.2021.141213
UR  - https://www.sciencedirect.com/science/article/pii/S0921509321004822?via%3Dihub
UR  - http://hdl.handle.net/10044/1/88257
VL  - 815
ER  -
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