Structue and strength of fine-grain copper after cryorolling and single electrо-pulsing of different capacity

M.V. Markushev, R.R. Ilyasov, S.V. Krymskiy, I.S. Valeev ORCID logo , O.S. Sitdikov show affiliations and emails
Received 29 October 2021; Accepted 12 November 2021;
This paper is written in Russian
Citation: M.V. Markushev, R.R. Ilyasov, S.V. Krymskiy, I.S. Valeev, O.S. Sitdikov. Structue and strength of fine-grain copper after cryorolling and single electrо-pulsing of different capacity. Lett. Mater., 2021, 11(4) 491-496
BibTex   https://doi.org/10.22226/2410-3535-2021-4-491-496

Abstract

It was found that the electric pulse treatment of cryorolled cooper leads to the development of recovery processes and continuous static recrystallization, provides a transition from in-situ recrystallization to grain growth, which leads to a sharp decrease in hardness.The effect of a treatment combining isothermal cryogenic rolling and single electro-pulsing on the structure and hardness of M1 grade copper with an initial grain size of 10 –15 μm was investigated. Copper was deformed at liquid nitrogen temperature by multi-pass rolling with a total reduction of 90 %. Subsequent electro-pulse treatment (EPT) was carried out in the interval of integral current densities (Kj) from 3.5 ×104 to 8.1×104 A2 s / mm4. Nearly two-fold strengthening of Cu under rolling was found due to the formation of a heavily deformed (sub)grain structure with a crystallite size of the order of 1 μm and a fraction of high-angle boundaries of about 30 %. With further EPT with an energy of 3.5 ×104 A2s / mm4, the processes of recovery predominantly occur, resulting in slight softening with a simultaneous strong decrease in micro-distortions of the crystal lattice and dislocation densities. Processing with higher energies resulted in a sharp drop in the hardness of Cu owing to an activation of in-situ continuous static recrystallization, forming regions of new fine defect-free grains, whose fraction increased with Kj, and intensified the formation of annealing twins. As a result of EPT with Kj in the range of 5×104 – 7×104 A2s / mm4, a uniform fine-grained structure with a grain size of near 2 μm and a fraction of high-angle boundaries of about 90 %, a third part of which were twins of Σ3, was obtained. With a further increase in pulsing energy to 8.1×104 A2s / mm4, normal grain growth to 4 μm with minor changes in the angular parameters of the structure were observed. The nature of structural and mechanical behavior of copper is discussed. A conclusion is made on the viability of the use of combination of cryogenic rolling and EPT to manufacture ultrafine- and fine-grain sheets of different strength out of copper.

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Funding

1. Russian Foundation for Basic Research - 19-08-00953А