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{Lu:2021:10.1016/j.jmatprotec.2021.117189,
author = {Lu, X and Yu, J and Yardley, VA and Liu, H and Shi, Z and Lin, J},
doi = {10.1016/j.jmatprotec.2021.117189},
journal = {Journal of Materials Processing Technology},
pages = {1--14},
title = {Solid-state welding and microstructural features of an aluminium alloy subjected to a novel two-billet differential velocity sideways extrusion process},
url = {http://dx.doi.org/10.1016/j.jmatprotec.2021.117189},
volume = {296},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A novel process for fabricating cross-sectional shapes of curved profiles in industrial applications, two-billet differential velocity sideways extrusion (DVSE), is proposed in this study. The feasibility of the process is demonstrated by fabricating solid bars of the aluminium alloy AA1070 through the solid-state welding of two billets at elevated temperature. Microstructural examination has shown that the weld formed between the two billets consists of an unsound area in the dead metal zone within the die and a sound bonding area in the welding zone. Along the welding path, the effective and normal strains gradually increase while the shear strain decreases, leading to the transformation of grains from equiaxed to bamboo-like structures and increases in the hardness, average grain size, and fraction of low angle grain boundaries. The shear strength of the welded extrudate is larger than that of the material without welding. The effective strain in the welding zone is larger than that in other zones. Increasing the temperature or speed of extrusion decreases the unsound bonding area length and the shearing angle, thus improving the uniformity of distribution of the shear strain. The grain diameter is refined from ∼500μm in the initial billet to ∼47μm in the welding zone of the extrudate formed at 0.05mm/s and 450 . The hardness of the extrudate formed at 400°C and 0.1mm/s is ∼19 % larger than that of the initial billet, and is decreased by decreasing the extrusion speed or increasing the temperature.
AU  - Lu,X
AU  - Yu,J
AU  - Yardley,VA
AU  - Liu,H
AU  - Shi,Z
AU  - Lin,J
DO  - 10.1016/j.jmatprotec.2021.117189
EP  - 14
PY  - 2021///
SN  - 0924-0136
SP  - 1
TI  - Solid-state welding and microstructural features of an aluminium alloy subjected to a novel two-billet differential velocity sideways extrusion process
T2  - Journal of Materials Processing Technology
UR  - http://dx.doi.org/10.1016/j.jmatprotec.2021.117189
UR  - https://www.sciencedirect.com/science/article/pii/S0924013621001497?via%3Dihub
UR  - http://hdl.handle.net/10044/1/88402
VL  - 296
ER  -
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