Retrogression and re-ageing of 7075 aluminium alloy: microstructural characterization

• Tipo: Artigo em Revista Científica Internacional
• Data: 1999

Autores

Viana, F (Autor) FEUP; Pinto, AMP (Autor) Outra; Santos, HMC (Autor) Outra; Lopes, AB (Autor) Outra

Revista

Título: Journal of Materials Processing Technology

Vol. 93

Páginas: 54-59

ISSN: 0924-0136

Editora: Elsevier

Indexação

ISI Web of Knowledge - 115 Citações

ISI Web of Science

Scopus - 155 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

Outras Informações

ID Authenticus: P-001-3KE

DOI: 10.1016/s0924-0136(99)00219-8

Abstract (EN): Industrial Summary: The 7075 aluminium alloy presents a low stress corrosion cracking strength when aged to achieve maximum mechanical strength, T6 temper; high stress corrosion cracking strength is attained with overageing, T7 temper; but with loss of mechanical strength. Retrogression and re-ageing treatments improves the stress corrosion behaviour of the alloy whilst maintaining the mechanical resistance of the T6 temper. The microstructures produced by the retrogression and re-ageing treatments were characterized in this study by transmission electron microscopy, electron diffraction and differential scanning calorimetry The precipitation is extremely fine and distributed homogeneously inside the grains, being slightly denser and more stable than that resulting from the T6 temper; whilst the grain boundary precipitation is quite different from that resulting from T6 treatment, the particles being coarser, and much closer to the precipitation resulting from T7 temper. The retrogression temperature is the main property controlling factor; a higher retrogression temperature, increasing the dissolution degree, promotes the formation of more stable precipitates on re-ageing.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6