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Influence of Used Tea Powders on the Microstructure and Mechanical Properties of Recycled Aluminium 5083

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Abstract:

This study examines the significant potential of used tea powders (UTP) as a sustainable additive for recycling aluminium alloy 5083. By remelting and recasting aluminium chips with varying quantities of UTP (0 g, 2 g, 4 g, and 6 g), this research aims to provide insights into the microstructural, mechanical, and surface characteristics of the resulting materials. Notably, the recycled aluminium exhibited smoother surfaces in comparison to the bulk alloy, particularly with moderate UTP additions of 2 g to 4 g, which effectively reduced surface roughness. The highest hardness recorded was 57.66 HV for the recycled aluminium without any additives; however, the initial addition of UTP led to a decrease in hardness, which interestingly stabilised at higher concentrations. Microstructural analysis indicated refined grain structures and the formation of carbon- and oxygen-rich phases when optimal levels of UTP were employed. Conversely, higher quantities resulted in some degree of agglomeration and porosity. In conclusion, UTP demonstrates considerable promise as an environmentally friendly modifier that enhances microstructure and supports sustainable practices in aluminium recycling.

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Periodical:

Materials Science Forum (Volume 1194)

Pages:

45-50

DOI:

https://doi.org/10.4028/p-Ov09QG

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Online since:

June 2026

Authors:

Intan Syafiqah Isma Harisham, Idham Shahirudin Mohd Ali, Shahrul Azmir Osman, Tay Sin Kiat, Saliza Azlina Osman*

Keywords:

Aluminium 5083, Microhardness, Re-Casting Process, Recycling Process, Surface Roughness, Used Tea Powders

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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