Effect of equal channel angular pressing on the structure and mechanical properties of Al–6Ca–3Ce alloy

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Resumo

The effect of equal-channel angular pressing (ECAP) on the structure and mechanical properties of experimental eutectic Al–6Ca–3Ce (wt %) alloy is studied. The ECAP of initial cast blanks is fulfilled under isothermal conditions at a temperature of 200°С using 4 passes and the BC route of extruding. As a result of ECAP, both the strength and plasticity of the alloy are found to increase by 2 and 5 to 15 times, respectively. The anisotropy of properties is found, i.e., the strength in the transverse direction is lower by 5 to 15%, whereas the relative elongation is 3 times higher than those along the lengthwise direction. The achieved combination of properties is due to the formation of ultrafine structure characterized by low density of dislocation and the refinement of eutectic particles. The higher plasticity of samples in the transverse direction is due to the lower length of boundaries of eutectic particles retarding the movement of dislocations.

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Sobre autores

V. Andreev

Baikov Institute of Metallurgy and Materials Science

Email: csaap@mail.ru
Rússia, Moscow

M. Barykin

National Research Technological University MISiS

Email: csaap@mail.ru
Rússia, Moscow

R. Karelin

Baikov Institute of Metallurgy and Materials Science, RAS; National Research Technological University MISiS

Email: csaap@mail.ru
Rússia, Moscow; Moscow

V. Komarov

Baikov Institute of Metallurgy and Materials Science, RAS; National Research Technological University MISiS

Email: csaap@mail.ru
Rússia, Moscow; Moscow

E. Naumova

National Research Technological University MISiS

Email: csaap@mail.ru
Rússia, Moscow

S. Rogachev

Baikov Institute of Metallurgy and Materials Science; National Research Technological University MISiS

Autor responsável pela correspondência
Email: csaap@mail.ru
Rússia, Moscow; Moscow

N. Tabachkova

National Research Technological University MISiS

Email: csaap@mail.ru
Rússia, Moscow

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2. Fig. 1. Microstructure of the Al–6Ca–3Ce alloy in the cast state (optical microscopy).

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3. Fig. 2. Microstructure of the Al–6Ca–3Ce alloy formed as a result of ECAP, in the transverse (a) and longitudinal (b) sections of the sample (optical microscopy). The arrow indicates the pressing direction.

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4. Fig. 3. Microstructure of the Al–6Ca–3Ce alloy after ECAP, observed in the transverse (a, b) and longitudinal (c, d) sections of the sample (transmission microscopy). In Fig. 3a: 1, 2 — areas in which the MRSA analysis was performed.

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5. Fig. 4. Results of MRSA analysis of the Al–6Ca–3Ce alloy after ECAP: (a) spectrum in region No. 1 in Fig. 3a; (b) spectrum in region No. 2 in Fig. 3a.

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6. Fig. 5. X-ray diffraction patterns of the Al–6Ca–3Ce alloy after ECAP, obtained in the longitudinal and transverse sections of the sample.

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7. Fig. 6. Stress-strain curves of the Al–6Ca–3Ce alloy before and after ECAP.

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