A review on solid-state recycling of aluminum machining chips and their morphology effect on recycled part quality

Altharan, Yahya M.; Shamsudin, S.; Al-Alimi, Sami; Saif, Yazid; Zhou, Wenbin

doi:10.1016/j.heliyon.2024.e34433

Heliyon

2024

DOI: 10.1016/j.heliyon.2024.e34433

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A review on solid-state recycling of aluminum machining chips and their morphology effect on recycled part quality

Yahya M. Altharan,

S. Shamsudin,

Sami Al-Alimi

et al.

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2024

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Cited by 3 publications

References 125 publications

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Application of a hybrid two-stage optimization framework for sustainable machining: a case study

Atif,

Junejo,

Amin

2024

Int J Adv Manuf Technol

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Application of a hybrid two-stage optimization framework for sustainable machining: a case study

Atif,

Junejo,

Amin

2024

Int J Adv Manuf Technol

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Microstructure and Corrosion Resistance of 7075 Aluminium Alloy Composite Material Obtained from Chips in the High-Energy Ball Milling Process

Kościelniak,

Groch,

Nowak

et al. 2024

Materials

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The high-energy ball milling process was applied to fabricate a composite material from 7075 aluminium alloy milling chips, silicon carbide, and titanium dioxide powders. Raw materials were ground, and the obtained powders were cold pressed and sintered. It was demonstrated that this method can be used in the recycling of aluminium alloy scrap characterised by a high surface-to-volume ratio, and also that chemical removal of the oxide layer from chips is not necessary. The finest particles, with 50 vol.% of their population below 36 μm, were obtained after grinding for 60 min at a 1000 rpm rotational speed. Such an intensive grinding was necessary to fabricate the compact composite material with a homogeneous microstructure and a low porosity of 0.7%. The corrosion resistance of the composites was studied in 3.5 wt.% NaCl solution using cyclic voltammetry and electrochemical impedance spectroscopy, and corrosion rates in the range of ca. 342 and 3 μA∙cm−2 were obtained. The corrosion mechanism includes aluminium alloy dissolution at the matrix/reinforcement interphase and around intermetallic particles localised within the matrix grains.

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Innovative Solid-State Recycling of Aluminum Alloy AA6063 Chips Through Direct Hot Rolling Process

Carta,

Ben Khalifa,

Buonadonna

et al. 2024

Metals

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In this paper, the feasibility of an innovative solid-state recycling process for aluminum alloy AA6063 chips through direct rolling is studied, with the aim of offering an environmentally sustainable alternative to conventional recycling processes. Aluminum chips, produced by milling an AA6063 billet without the use of lubricants, were first compacted using a hydraulic press with a 200 kN load and subsequently heat-treated at 570 °C for 6 h. The compacted chips were directly hot-rolled through several successive passes at 490 °C. The bulk material underwent the same rolling schedule to allow comparison of the samples and assess the process, in terms of mechanical properties and microstructure. All the rolled samples were tested by tensile and microhardness tests, whereas the microstructure was observed by an optical microscope and the EBSD-SEM technique. The fracture surface of all tested samples was analyzed by SEM. Recycled samples exhibited good mechanical properties, comparable to those of the bulk material. In particular, the bulk material showed an ultimate tensile strength of 218 MPa, in contrast to 177 MPa for the recycled chips, and comparable elongation at break. This study demonstrates that direct rolling of compacted aluminum chips is both technically feasible and has environmental benefits, offering a promising approach for sustainable aluminum recycling in industrial applications within a circular economy framework.

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A review on solid-state recycling of aluminum machining chips and their morphology effect on recycled part quality

Cited by 3 publications

References 125 publications

Application of a hybrid two-stage optimization framework for sustainable machining: a case study

Application of a hybrid two-stage optimization framework for sustainable machining: a case study

Microstructure and Corrosion Resistance of 7075 Aluminium Alloy Composite Material Obtained from Chips in the High-Energy Ball Milling Process

Innovative Solid-State Recycling of Aluminum Alloy AA6063 Chips Through Direct Hot Rolling Process

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