Adding Value to Secondary Aluminum Casting Alloys: A Review on Trends and Achievements

• Tipo: Outra Publicação em Revista Científica Internacional
• Data: 2023

Autores

Nunes, H (Autor) Outra; Emadinia, O (Autor) Outra; Soares, R (Autor) Outra; Vieira, MF (Autor) FEUP; Ana Reis (Autor) FEUP

Revista

Título: Materials

Vol. 16

Página Final: 895

ISSN: 1996-1944

Editora: MDPI

Indexação

ISI Web of Knowledge - 0 Citações

Scopus

Outras Informações

ID Authenticus: P-00X-R98

DOI: 10.3390/ma16030895

Abstract (EN): Aluminum is a critical element of the circular economy as it can be recycled several times. Moreover, Al recycling is a more economically and environmentally efficient procedure than the primary Al production from ores. Secondary aluminum alloys are mostly used in casting applications since it is possible to accommodate their chemical composition through secondary manufacturing processes. However, the quality of the alloys may be considerably altered during the different steps of the recycling process. Inadequate waste sorting might result in excessive contamination. Iron is the most dangerous contaminant because it causes brittle and fragile intermetallic phases, which significantly impacts the mechanical characteristics of alloys. In addition, the microstructure of the alloy changes significantly after multiple cycles of remelting. These issues lead to the downcycling of aluminum, i.e., in other words, the reduction in the overall quality of the alloys. Thus, it has been shown that a number of procedures, including ultrasonic melt treatment and microalloying with rare earths, can somewhat alter the shape of the Fe-rich phases in order to reduce the shortcomings of downcycling. However, a solid mechanical characterization is still missing in order to improve the Fe-rich phase alteration.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 24