Production of aluminum-based composites from recycled chips by hot extrusion processing

Articles in Press

Document Type : Original Article

Authors

1 Mechanical dep., arak university of technology

2 Department of Mechanical Engineering, Arak University of Technology

10.22034/ijme.2024.432303.1889

Abstract

About 30% of aluminum production costs are spent on energy, so recycling aluminum, especially in solid form, plays a significant role in reducing energy consumption and environmental pollution. In this paper, different aluminum-based composites were produced by removing the melting and casting process and using only cold pressing and then hot extrusion of the powder obtained from recycled aluminum 6061 chips and ceramic nanopowders of aluminum and titanium oxides at the appropriate temperature and reduction then changes of microstructural and mechanical properties of the produced parts were investigated. The microstructural results showed that ceramic powders are uniformly distributed inside the aluminum chip powders and the material properties are almost uniform and the grains on the outer surface of the part have a finer and more stretched structure than the inner regions and the smallest grain size was observed in the composite structure with aluminum oxide. Evaluation of the mechanical properties of the samples indicated that the recycled aluminum sample has a hardness of 122 Vickers and an ultimate strength of 433 MPa, which according to the hardness and ultimate strength of the original aluminum sample (132 Vickers and 500 MPa), the properties are acceptable and almost close to the original sample for a recycled sample, and by adding titanium oxide to the chips powder, the hardness of composite sample increased to 110 Vickers, and the final strength reached about 406 MPa, while aluminum oxide increased both the hardness and strength of the composite to 133 Vickers and 507 MPa, respectively.

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Iranian Journal of Manufacturing Engineering

Articles in Press, Accepted Manuscript
Available Online from 28 February 2024

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