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Microstructural characteristics and mechanical properties of Al-2024 alloy processed via a rheocasting route

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Abstract

This article reports the effects of stirring speed and T6 heat treatment on the microstructure and mechanical properties of Al-2024 alloy synthesized by a rheocasting process. There was a decrease in grain size of α-Al particles corresponding to an increase in stirring speed. By increasing the stirring speed, however, the globularity of matrix particles first increased and then declined. It was also found that the hardness, compressive strength, and compressive strain increased with the increase of stirring speed. Microstructural studies revealed the presence of nonsoluble Al15(CuFeMn)3Si2 phase in the vicinity of CuAl2 in the rheocast samples. The required time for the solution treatment stage was also influenced by stirring speed; the solution treatment time decreased with the increase in stirring speed. Furthermore, the rheocast samples required a longer homogenization period compared to conventionally wrought alloys. Improvements in hardness and compressive properties were observed after T6 heat treatment.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, 9177948944, Iran

    Behnam Rahimi & Mohsen Haddad-Sabzevar

  2. Faculty of Materials Science and Engineering, K.N. Toosi University of Technology, Tehran, 1999143344, Iran

    Hamed Khosravi

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  1. Behnam Rahimi
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  2. Hamed Khosravi
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  3. Mohsen Haddad-Sabzevar
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Correspondence to Hamed Khosravi.

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Rahimi, B., Khosravi, H. & Haddad-Sabzevar, M. Microstructural characteristics and mechanical properties of Al-2024 alloy processed via a rheocasting route. Int J Miner Metall Mater 22, 59–67 (2015). https://doi.org/10.1007/s12613-015-1044-8

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  • DOI: https://doi.org/10.1007/s12613-015-1044-8

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