Impact of deep cryogenic treatment on microstructural and electrical properties of recycled aluminium alloys
Pantnagar Journal of Research, Volume - 23, Issue - 1 ( January-April 2025)Published: 2025-04-30
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Abstract
This study investigated the impact of Deep Cryogenic Treatment (DCT) on the microstructural and electrical properties of a recycled aluminium alloy, aiming to enhance its performance. Samples were subjected to DCT at temperatures below -196°C, and their properties were compared to those of the untreated samples. Microstructural analysis using optical microscopy revealed a significant reduction in the size and density of the inclusions and defects after DCT, indicating a more refined and homogeneous microstructure. Electrical resistivity measurements demonstrated a substantial decrease in both resistance and resistivity following DCT, suggesting improved electrical conductivity. These enhancements are attributed to the phase redistribution, impurity dissolution, stress relaxation, and reduced dislocation density induced by the cryogenic treatment. These findings highlight the potential of DCT to effectively optimise the microstructural and electrical properties of aluminium alloys derived from scrap materials, making them suitable for applications requiring enhanced conductivity and mechanical performance. This research suggests that DCT is a viable approach for improving the quality and applicability of recycled aluminium alloys
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