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

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 s...

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Bibliographic Details
Published in:Journal of materials research 2016-12, Vol.31 (24), p.3850-3859
Main Authors: Alexandrov, Igor V., Chembarisova, Roza G., Zainullina, Liliya I., Wei, Kun Xia, Wei, Wei, Hu, Jing
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Annealing
Applied and Technical Physics
Biomaterials
Chemical elements
COPPER ALLOYS (40 TO 99.3 CU)
COPPER ALUMINUM ALLOYS
Copper base alloys
DEFORMATION
Dislocations
DUCTILITY
Grain boundaries
Grain size
Hardening
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Mechanical properties
Microstructure
MICROSTRUCTURES
Nanostructure
Nanotechnology
Strain hardening
Strength
Temperature
TENSILE STRENGTH
Ultimate tensile strength
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Summary: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.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2016.451