Structure and mechanical properties of Al-Ca-(Fe, La) eutectic alloys after equal-channel angular pressing

S.O. Rogachev, V.A. Andreev ORCID logo , M.A. Barykin, A.V. Doroshenko, R.D. Karelin, V.S. Komarov ORCID logo , E.A. Naumova, N.Y. Tabachkova показать трудоустройства и электронную почту
Получена 03 января 2024; Принята 24 апреля 2024;
Эта работа написана на английском языке
Цитирование: S.O. Rogachev, V.A. Andreev, M.A. Barykin, A.V. Doroshenko, R.D. Karelin, V.S. Komarov, E.A. Naumova, N.Y. Tabachkova. Structure and mechanical properties of Al-Ca-(Fe, La) eutectic alloys after equal-channel angular pressing. Письма о материалах. 2024. Т.14. №2. С.167-172
BibTex   https://doi.org/10.48612/letters/2024-2-167-172

Аннотация

Our study is the first to demonstrate that lanthanum, even in small quantities, being part of the Al–Ca–La complex eutectics, has a decisive influence on the microstructure formation and mechanical properties of Al–Ca alloys.The effect of equal channel angular pressing (ECAP) on the structure and mechanical properties of two eutectic alloys, namely Al-6 % Ca-1 % Fe and Al-5 % Ca-3 % La, was studied. The as-cast alloys were processed by ECAP through 4 passes at 200°C. According to the results obtained, the Al-6 % Ca-1 % Fe alloy is more prone to hardening during ECAP than the Al-5 % Ca-3 % La alloy. As a result of ECAP, the yield strength of the Al-5 % Ca-3 % La and Al-6 % Ca-1 % Fe alloys increased by 1.5 and 2.8 times for, respectively. The relative elongation of the ECAP processed Al-5 % Ca-3 % La and Al-6 % Ca-1 % Fe alloys was 9 and 2 %, respectively. In the ECAP processed Al-6 % Ca-1 % Fe alloy the eutectic structure disappears, and a high dislocation density accumulates; while in the ECAP-processed Al-5 % Ca-3 % La alloy the eutectic structure is retained, and the dislocation density increases slightly. The results obtained confirm that that lanthanum, even in small quantities, being part of complex eutectics, has a decisive influence on the microstructure formation and mechanical properties of Al-Ca alloys.

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Финансирование на английском языке

1. Russian Science Foundation - 20-19-00746-P