High strain-rate superplasticity of ultrafine-grained Al-Mg-Mn-Zn-Zr alloy

V.V. Astanin, E.V. Bobruk, I.A. Ramazanov ORCID logo , M.M. Abramova ORCID logo , N.G. Zaripov, N.A. Enikeev ORCID logo show affiliations and emails
Received 30 August 2023; Accepted 22 October 2023;
Citation: V.V. Astanin, E.V. Bobruk, I.A. Ramazanov, M.M. Abramova, N.G. Zaripov, N.A. Enikeev. High strain-rate superplasticity of ultrafine-grained Al-Mg-Mn-Zn-Zr alloy. Lett. Mater., 2023, 13(4s) 408-413
BibTex   https://doi.org/10.22226/2410-3535-2023-4-408-413


High-rate SP at a temperature of 300°C is carried out by combining cooperative grain-boundary sliding and intragranular dislocation slip in UFG Al-Mg-Mn alloyThe microstructure evolution in 1565ch alloy of the Al-Mg-Mn-Zn-Zr system during thermomechanical treatment including severe plastic deformation and subsequent isothermal rolling at a temperature of 200°C is studied. The treatment resulted in the formation of an ultrafine-grained (UFG) structure with regulated distribution of Al6Mn, Al3Zr and Al3Mg2 phases both in the body and along the grain boundaries in 1565ch alloy which made it possible to implement the effect of superplasticity (SP) at 300°C and high strain rates of 5 ×10−2, 10−2 and 5 ×10−3 s−1. The deformation relief formed on the gauge part of UFG 1565ch samples at the stage of a steady-state SP flow is analyzed. It has been established that high-rate SP at a temperature of 300°C occurs by a combination of cooperative grain-boundary sliding and intragranular dislocation slip.

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