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

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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.

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ACKNOWLEDGMENTS

The authors are grateful for the support to Natural Science Foundation of Jiangsu Province, P. R. China under grant BK20131144, the Science Project of Changzhou, P. R. China under grant CZ20130021, the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) under grant no. [2014] 9, and to the Ministry of Education and Science of the Russian Federation within the Framework of the Basic and Design Part of the State Task No. 11.2540.2014/K Educational Organization of Higher Education.

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Authors and Affiliations

  1. Department of Physics, Ufa State Aviation Technical University, Ufa, 450008, Russia

    Igor V. Alexandrov, Roza G. Chembarisova & Liliya I. Zainullina

  2. School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, People’s Republic of China

    Kun Xia Wei, Wei Wei & Jing Hu

  3. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, People’s Republic of China

    Kun Xia Wei, Wei Wei & Jing Hu

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  1. Igor V. Alexandrov
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  2. Roza G. Chembarisova
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  3. Liliya I. Zainullina
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  4. Kun Xia Wei
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  5. Wei Wei
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Correspondence to Igor V. Alexandrov or Wei Wei.

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Alexandrov, I.V., Chembarisova, R.G., Zainullina, L.I. et al. Analysis of strength and ductility of bulk nanostructured Cu and Cu–Al alloys by means of computer modeling. Journal of Materials Research 31, 3850–3859 (2016). https://doi.org/10.1557/jmr.2016.451

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