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Microstructure evolution of accumulative roll bonding processed pure aluminum during cryorolling

Published online by Cambridge University Press:  03 March 2016


Hailiang Yu
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
Hui Wang
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
Cheng Lu
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
A. Kiet Tieu
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
Huijun Li
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
Ajit Godbole
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
Xiong Liu
Affiliation:
School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia
Charlie Kong
Affiliation:
Electron Microscope Unit, University of New South Wales, Sydney, New South Wales 2052, Australia
Xing Zhao
Affiliation:
Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, Hunan, China; and School of Mechanical, Materials & Mechatronics Engineering, University of Wollongong, New South Wales 2500, Australia

Abstract

The microstructure evolution and mechanical properties of ultrafine-grained (UFG) Al sheets subjected to accumulative roll bonding (ARB) and subsequent cryorolling was studied. Cryorolling can suppress the dynamic softening of UFG Al sheets subjected to ARB at room temperature. After the third ARB pass, the grains are slightly refined as the number of ARB passes increases. However, the grains are significantly refined further during cryorolling. The grain size of 460 nm achieved after the third ARB pass is reduced to 290 nm after two cryorolling passes with total reduction ratio 80%. Sheets subjected to ARB + cryorolling show improved mechanical properties compared to only ARB-processed sheets due to a change in the fraction of high-angle boundaries and elongated grains. The deformation mechanism for ultrafine grains at room temperature is determined by grain boundary sliding or dislocation-based recovery, while it is governed by dislocation glide at cryogenic temperature.


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Articles
Copyright
Copyright © Materials Research Society 2016 

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