The effect of compositional variations on characteristics of coarse intermetallic particles in overaged 7000 aluminium alloys


Li, X.-M. and Starink, M.J. (2001) The effect of compositional variations on characteristics of coarse intermetallic particles in overaged 7000 aluminium alloys. Materials Science and Technology, 17, (11), 1324-1328.

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Description/Abstract

To provide an understanding of how compositional variations affect the characteristics of coarse intermetallic particles in 7xxx alloys, three Al-Zn-Mg-Cu-Zr aluminium alloy plates with different Zn, Mg and Cu contents were studied by optical microscopy based image analysis, scanning electron microscopy (SEM), energy disperse X-ray spectroscopy (EDS) and differential scanning calorimetry (DSC). These coarse intermetallic particles are detrimental, especially to the toughness of the alloy. The experimental observations were interpreted successfully on the basis of the phase diagram and the temperature dependent S phase solvus which was derived on the basis of the regular solution model. The temperature dependent S phase solvus indicates that some compositions in the composition windows of 7050 and 7x75 type alloys will give rise to the detrimental S phase that can not be dissolved during solution treatment. Also the T phase is analysed and conditions for its formation and dissolution are discussed. It is shown that the present results can produce useful information on alloy design and thermo-mechanical processing via microstructural control.

Item Type: Article
ISSNs: 0267-0836 (print)
Related URLs:
Keywords: intermetallic particles, coarse particles, S phase, T phase, Al-Zn-Mg alloy, solution treatment, homogenizing, precipitate, incipient melting, DSC, calorimetry, toughness
Subjects: T Technology > T Technology (General)
T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 21741
Date Deposited: 17 Mar 2006
Last Modified: 27 Mar 2014 18:11
Contact Email Address: M.J.Starink@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/21741

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