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Article

Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling

1
Physical Department, Chelyabinsk State University, 454001 Chelyabinsk, Russia
2
Laboratory of Mechanical Properties of Nanoscale Materials and Superalloys, Belgorod State University, 308015 Belgorod, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Appl. Sci. 2021, 11(11), 4906; https://doi.org/10.3390/app11114906
Received: 30 March 2021 / Revised: 24 May 2021 / Accepted: 24 May 2021 / Published: 26 May 2021
(This article belongs to the Topic Metallurgical and Materials Engineering)
We investigate the prolonged plastic deformation of aluminum containing θ′ phase with a multistage approach combining molecular dynamics (MD), continuum modeling (CM) and discrete dislocation dynamics (DDD). The time of performed MD calculations is sufficient for about a hundred dislocation–precipitate interactions. With this number of interactions, the inclusion of θ′ is not only cut, but also scattered into individual copper atoms in an aluminum matrix. Damage to the crystal structure of inclusion and activation of the cross-slip of dislocation segments cause a decrease in acting stresses in the MD system. The rate of this effect depends on θ′ diameter and occurs faster for small inclusions. The effect of decreasing the resistance of precipitate is further introduced into the dislocation–precipitate interaction CM by reducing the precipitate effective diameter with an increase in the number of interactions. A model of dislocation–precipitate interaction accounting for the softening of inclusions is further implemented into DDD. Dependences of flow stress in aluminum with θ′ phases on volume fraction and typical diameter of precipitates are obtained. Manifestation of inclusion softening is possible in such an alloy, which leads to the flow stress decrease during deformation. The range of volume fractions and typical diameters of θ′ phases corresponding to the possible decrease in flow stress is distinguished. View Full-Text
Keywords: aluminum alloys; dislocation–precipitate interaction; θ′ phase degradation; softening of alloy; molecular dynamics; continuum modeling aluminum alloys; dislocation–precipitate interaction; θ′ phase degradation; softening of alloy; molecular dynamics; continuum modeling
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MDPI and ACS Style

Krasnikov, V.S.; Mayer, A.E.; Pogorelko, V.V.; Gazizov, M.R. Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling. Appl. Sci. 2021, 11, 4906. https://doi.org/10.3390/app11114906

AMA Style

Krasnikov VS, Mayer AE, Pogorelko VV, Gazizov MR. Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling. Applied Sciences. 2021; 11(11):4906. https://doi.org/10.3390/app11114906

Chicago/Turabian Style

Krasnikov, Vasiliy S., Alexander E. Mayer, Victor V. Pogorelko, and Marat R. Gazizov. 2021. "Influence of θ′ Phase Cutting on Precipitate Hardening of Al–Cu Alloy during Prolonged Plastic Deformation: Molecular Dynamics and Continuum Modeling" Applied Sciences 11, no. 11: 4906. https://doi.org/10.3390/app11114906

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