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Analysis of strength and ductility of bulk nanostructured Cu and Cu–Al alloys by means of computer modeling

Published online by Cambridge University Press:  13 December 2016

Igor V. Alexandrov ,
Roza G. Chembarisova ,
Liliya I. Zainullina ,
Kun Xia Wei ,
Wei Wei  and
Jing Hu
Igor V. Alexandrov*
Affiliation:
Department of Physics, Ufa State Aviation Technical University, Ufa 450008, Russia
Roza G. Chembarisova
Affiliation:
Department of Physics, Ufa State Aviation Technical University, Ufa 450008, Russia
Liliya I. Zainullina
Affiliation:
Department of Physics, Ufa State Aviation Technical University, Ufa 450008, Russia
Kun Xia Wei
Affiliation:
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, People’s Republic of China; and Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, People’s Republic of China
Wei Wei*
Affiliation:
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, People’s Republic of China; and Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, People’s Republic of China
Jing Hu
Affiliation:
School of Materials Science and Engineering, Changzhou University, Changzhou 213164, People’s Republic of China; and Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, People’s Republic of China
*
a) Address all correspondence to these authors. e-mail: IgorVAlexandrov@yandex.ru
b) e-mail: benjamin.wwei@163.com
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Abstract

The deformation mechanisms responsible for the strength and ductility of nanostructured Cu and Cu–Al alloys processed by high pressure torsion have been analyzed in frames of a model of elastic–plastic medium and using the available experimental data. The income of the Peierls strength, as well as solid solution hardening, dislocation hardening, twinning hardening, taking into account possible annihilation processes has been estimated. It was shown that in the Cu–5 at.% Al alloy annihilation processes contribute to the maintenance of deformation. The material is hardened by the accumulation of dislocations at the twin boundaries, postponing the moment of reaching the ultimate strength. In the Cu–16 at.% Al alloy processes of the annihilation are limited. As a result, the possibility of further deformation is limited and the degree of homogeneous deformation decreases in comparison with the case of the Cu–5 at.% Al alloy. Significantly increased concentration of deformation vacancies contributes to the destruction of the former alloy as well.

Keywords

CuCu–Al alloysnanostructurehigh pressure torsionstrengthductility
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3850 - 3859
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Copyright
Copyright © Materials Research Society 2016 

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References

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