Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets

Ying Yan; Guo-qiang Zhang; Li-jia Chen; Xiao-wu Li

doi:10.1007/s12613-019-1839-0

Volume 26 Issue 11

Nov. 2019

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International Journal of Minerals, Metallurgy and Materials > 2019 > 26(11): 1450-1456. > DOI: 10.1007/s12613-019-1839-0

Ying Yan, Guo-qiang Zhang, Li-jia Chen, and Xiao-wu Li, Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets, Int. J. Miner. Metall. Mater., 26(2019), No. 11, pp.1450-1456. https://dx.doi.org/10.1007/s12613-019-1839-0

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Research Article

Thickness-related synchronous increase in strength and ductility of ultrafine-grained pure aluminum sheets

Ying Yan¹⁾,
Guo-qiang Zhang¹⁾,
Li-jia Chen²⁾ and
Xiao-wu Li^1), ,

Author Affilications

Department of Materials Physics and Chemistry, School of Materials Science and Engineering, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

Funds:

This work was financially supported by the National Natural Science Foundation of China (Nos. 51571058 and 51871048), and the Open Foundation of Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, China (No. ATM20170001).

Received: 24 December 2018; Revised: 02 March 2019; Accepted: 05 March 2019;

Graphical Abstract

Abstract

Abstract

To explore the specimen size effect of mechanical behavior of ultrafine-grained (UFG) materials with different structures, UFG Al sheets processed by equal channel angular pressing (ECAP) were selected as target materials and the dependency of tensile behavior on sheet thickness (t) was systematically investigated. The strength and ductility of ECAPed UFG Al sheets were improved synchronously as t increased from 0.2 to 0.7 mm, and then no apparent change occurred when t reached to 0.7 and 1.0 mm. The corresponding microstructure evolved from dislocation networks in equiaxed grains into the walls and subgrains and finally into the dominated cells in elongated grains or subgrains. Meanwhile, dense shear lines (SLs) and shear bands (SBs) were clearly observed and microvoids and cracks were initiated along SBs with the increase of t. These observations indicated that the plastic deformation of UFG Al sheets was jointly controlled by shear banding, dislocation sliding, and grain-boundary sliding. Furthermore, the propagation of SBs became difficult as t increased. Finally, the obtained results were discussed and compared with those of annealed UFG Al and UFG Cu.
- ultrafine-grained pure Al,
- specimen size effect,
- strength,
- ductility

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References (32)

References

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