Direct hot rolling as a solid-state recycling process for green sheets production
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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28th International ESAFORM Conference on Material Forming, ESAFORM 2025. ed. / Pierpaolo Carlone; Luigino Filice; Domenico Umbrello. Association of American Publishers, 2025. p. 1449-1459 (Materials Research Proceedings; Vol. 54).
Research output: Contributions to collected editions/works › Article in conference proceedings › Research › peer-review
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TY - CHAP
T1 - Direct hot rolling as a solid-state recycling process for green sheets production
AU - El Mehtedi, Mohamad
AU - Ben Khalifa, Noomane
AU - Buonadonna, Pasquale
AU - El Mohtadi, Rayane
AU - Marongiu, Gianluca
AU - Aymerich, Francesco
AU - Carta, Mauro
N1 - Conference code: 28
PY - 2025
Y1 - 2025
N2 - With the increasing demand for sustainable solutions in the recycling of aluminum alloys, solid-state recycling (SSR) offers an energy-efficient alternative by avoiding the melting phase, which typically leads to high energy consumption and material loss. This study presents a novel SSR process utilizing direct hot rolling to recycle aluminum alloy chips (EN AW-5754). The main objective is to evaluate this process's feasibility and assess the recycled sheets' mechanical and microstructural properties. Aluminum alloy chips were produced from the turning process of EN AW-AA5754 bars. The chips were compacted and subsequently heat-treated at 400°C for 2 hours. The compacted samples were then hot rolled in multiple passes, with a final cold rolling step to achieve a final thickness of 0,8 mm. Mechanical properties and microstructure were analyzed using tensile testing machine and SEM-EBSD technique. The recycled samples demonstrated mechanical properties comparable to those of reference material. SEM/EBSD analysis revealed broken oxides and a layered grain structure due to the prior chips’ boundaries. Overall, the results confirm that direct hot rolling can be a viable recycling method for aluminum alloys, offering significant energy and material savings compared to conventional processes.
AB - With the increasing demand for sustainable solutions in the recycling of aluminum alloys, solid-state recycling (SSR) offers an energy-efficient alternative by avoiding the melting phase, which typically leads to high energy consumption and material loss. This study presents a novel SSR process utilizing direct hot rolling to recycle aluminum alloy chips (EN AW-5754). The main objective is to evaluate this process's feasibility and assess the recycled sheets' mechanical and microstructural properties. Aluminum alloy chips were produced from the turning process of EN AW-AA5754 bars. The chips were compacted and subsequently heat-treated at 400°C for 2 hours. The compacted samples were then hot rolled in multiple passes, with a final cold rolling step to achieve a final thickness of 0,8 mm. Mechanical properties and microstructure were analyzed using tensile testing machine and SEM-EBSD technique. The recycled samples demonstrated mechanical properties comparable to those of reference material. SEM/EBSD analysis revealed broken oxides and a layered grain structure due to the prior chips’ boundaries. Overall, the results confirm that direct hot rolling can be a viable recycling method for aluminum alloys, offering significant energy and material savings compared to conventional processes.
KW - Chips
KW - Direct Hot Rolling
KW - EBSD
KW - EN AW-5754
KW - Solid-State Recycling
KW - Tensile Tests
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=105008067022&partnerID=8YFLogxK
U2 - 10.21741/9781644903599-158
DO - 10.21741/9781644903599-158
M3 - Article in conference proceedings
AN - SCOPUS:105008067022
SN - 9781644903599
T3 - Materials Research Proceedings
SP - 1449
EP - 1459
BT - 28th International ESAFORM Conference on Material Forming, ESAFORM 2025
A2 - Carlone, Pierpaolo
A2 - Filice, Luigino
A2 - Umbrello, Domenico
PB - Association of American Publishers
T2 - 28th International ESAFORM Conference on Material Forming - ESAFORM 2025
Y2 - 7 May 2025 through 9 May 2025
ER -