Microstructural evolution of 7012 alloy during the early stages of artificial ageing

Journal Article · Fri Nov 26 04:00:00 EST 1999 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(99)00315-8· OSTI ID:20006422

Ferragut, R; Somoza, A; Tolley, A

A study of the microstructural evolution of a commercial 7012 (Al-Zn-Mg-Cu) age-hardenable alloy following artificial ageing by high resolution and conventional transmission electron microscopy and positron annihilation lifetime spectroscopy is presented. At the early stages of decomposition, the microstructure included precipitation of either pre-precipitate solute clusters or Guinier-Preston zones and semi-coherent {eta}{prime} precipitates, with typical sizes between 1 and 10 nm. Quantitative information on the size, number density and morphology of the particles present in the microstructure was obtained. The results were correlated with those obtained using positron annihilation lifetime spectroscopy.

• Research Organization: Univ. Nacional del Centro de la Provincia de Buenos Aires, Tandil (AR)
• OSTI ID: 20006422
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 17 Vol. 47; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
ALUMINIUM BASE ALLOYS
ANNIHILATION
CRYSTAL-PHASE TRANSFORMATIONS
MICROSTRUCTURE
POSITRONS
PRECIPITATION
SPECTROSCOPY
TRANSMISSION ELECTRON MICROSCOPY