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

Record type: Article

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.

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Citation

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), pp. 1324-1328.

More information

Published date: 2001
Keywords: intermetallic particles, coarse particles, S phase, T phase, Al-Zn-Mg alloy, solution treatment, homogenizing, precipitate, incipient melting, DSC, calorimetry, toughness
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 21741
URI: http://eprints.soton.ac.uk/id/eprint/21741
ISSN: 0267-0836
PURE UUID: 0d74113f-a0b1-4322-b700-ab0be7a80e1f

Catalogue record

Date deposited: 17 Mar 2006
Last modified: 17 Jul 2017 16:25

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