Quantitative study on the precipitation behavior of dispersoids in DC-cast AA3003 alloy during heating and homogenization

• Published in: Acta materialia Vol. 51; no. 12; pp. 3415 - 3428
• Main Authors: Li, Y.J., Arnberg, L.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 16.07.2003; Elsevier Science
• Subjects: Aluminum; Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Homogenization; Materials science; Metals. Metallurgy; PFZ; Physics; Precipitation; Solid solution hardening, precipitation hardening, and dispersion hardening; aging; Solid solution, precipitation, and dispersion hardening; aging; Treatment of materials and its effects on microstructure and properties; Volume fraction of dispersoids; Homogenization; Precipitation; Aluminum; PFZ; Volume fraction of dispersoids; Homogenizing heat treatment; Aluminium base alloys; Electron diffraction; Experimental study; Heat treatments; Electrical measurement; Transmission electron microscopy; Microstructure
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/S1359-6454(03)00160-5

The precipitation behavior of dispersoids in DC-cast AA3003 billet during heating and homogenization at 600 °C has been studied by means of TEM, electrical conductivity measurement and image analysis. The orientation relationship between the dispersoids and matrix has been determined. The size, size distribution, number density and Mn/Fe ratio of dispersoids, and the area fraction of PFZ have been measured. The evolution of dispersoids during heat treatment is controlled by nucleation, growth, dissolution and coarsening. A method is proposed to measure the volume fraction of dispersoids from TEM images. The volume fraction of dispersoids precipitated during heating measured from TEM images is in good agreement with that calculated from electrical conductivity data.