Abstract
To overcome the restriction that the solid-state recycled processes can only be performed for the single brand of aluminium alloy chips, the feasibility of solid-state recycling of ADC12 and 6005A aluminium chips at varying ratios was investigated. The chips were first mixed by ball milling and then hot compacted before hot extrusion. The results revealed that ball milling can effectively mix and refine the chips, the chips gradually refined as the milling speed increased, in contrast, the milling time and the ratio of mixed chips had little effect on the morphology and average size of the chips. Microscopic examination showed that the recycled alloy with a mixing ratio of 9:1 between ADC12 and 6005A alloy achieved the best bonding quality, with the oxide layer and Fe-rich phases crushed and dispersed in the Al matrix, which improved the strength of the recycled alloy through the dispersion strengthening mechanism. The tensile test results also showed that the recycled alloy with the ratio of 9:1 between ADC12 and 6005A alloy has prominent mechanical properties, with the ultimate tensile strength, yield strength, and elongation of 271 and 151 MPa, and 12 % respectively. The investigation in this work provides a novel and effective method for the recycling of aluminium alloy chips and contributes to the sustainable resource utilization of the aluminium industry.

Key words
solid-state recycled, dissimilar aluminium chips, microstructure, mechanical properties

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