Structure and mechanical properties of Al–1.8Mn–1.6Cu alloy subjected to severe plastic deformation

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Resumo

The evolution of the structure and properties of an Al–1.8% Mn–1.6Cu alloy under deformation via high pressure torsion at room and elevated temperatures has been studied. The sequence of mechanisms of the formation of an ultrafine-grained structure has been established, and the cycling of the phase transformations, namely, the partial dissolution and precipitation of nanosized particles, has been observed. It has been found that aging, which occurs at the accumulated strain e = 6.9, suppresses the process of the grain growth under deformation at an elevated temperature. The effect of the structural-phase transformations on the strength and ductility of the alloy has been determined. As a result of deformation, the ultimate tensile strength increases by 3 times, and the yield strength increases by 7 times. Dynamic recrystallization results in a decrease in strength and in a considerable increase in the ductility of an alloy.

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Sobre autores

A. Petrova

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Autor responsável pela correspondência
Email: petrova@imp.uran.ru
Rússia, Ekaterinburg

V. Astafiev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: petrova@imp.uran.ru
Rússia, Ekaterinburg

A. Kuryshev

Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: petrova@imp.uran.ru
Rússia, Ekaterinburg

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2. Fig. 1. Structure of cast alloy.

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3. Fig. 2. Fragments of diffraction patterns of cast and deformed ALTEK alloys: b — enlarged section of the diffraction pattern fragment in Fig. 2a.

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4. Рис. 3. Микроструктура сплава АЛТЭК после 5 оборотов наковальни при КВД (ПЭМ): а — светлопольное изображение; б, в — темнопольные изображения в рефлексе фазы Al20Cu2Mn3.

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5. Fig. 4. Effect of the anvil revolution number and deformation temperature on the grain size of the ALTEK alloy: a — grain size distribution in the alloy after 5 revolutions at RT; b — after 10 revolutions at RT; c — after 15 revolutions at 280°C; d — change in average grain size.

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6. Fig. 5. Microstructure of the alloy after 15 revolutions of the anvil at a high pressure of 280°C (TEM): a — bright-field image; b — dark-field image in the reflection of the Al20Cu2Mn3 phase.

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