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Precipitation in liquid-quenched Al-Mg alloys; a study using X-ray diffraction line shift and line broadening

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Abstract

The precipitation process in liquid-quenched alloys of aluminium with 3.2, 10.5 and 16.7 at% Mg on ageing at 404, 450 and 492 K was investigated by X-ray diffraction analysis. It was found that only β′-phase precipitation occurred. During ageing, the average aluminium-matrix lattice parameter was determined from the line position, while a measure for the lattice spacing variations was deduced from line broadening. The β′-phase precipitation was found to occur inhomogeneously; for one alloy, splitting of diffraction lines was observed. The (asymmetrical) line-broadening changes observed during the β′-phase precipitation could consistently be conceived as dominated by the inhomogeneous nature of the β′-phase precipitation process. The (symmetrical) line broadening retained after completed precipitation was ascribed to the volume misfit between the precipitated β′-phase particles and the aluminium-matrix. Analysis of the aluminium-matrix lattice parameter changes with ageing time revealed that the β′-phase precipitation rate is governed by the magnesium volume diffusion.

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Authors and Affiliations

  1. Laboratory of Metallurgy, Delft University of Technology, Rotterdamseweg 137, 2628 AL, Delft, The Netherlands

    P. van Mourik, N. M. Maaswinkel, Th. H. de Keijser & E. J. Mittemeijer

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  1. P. van Mourik
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  2. N. M. Maaswinkel
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  3. Th. H. de Keijser
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  4. E. J. Mittemeijer
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van Mourik, P., Maaswinkel, N.M., de Keijser, T.H. et al. Precipitation in liquid-quenched Al-Mg alloys; a study using X-ray diffraction line shift and line broadening. J Mater Sci 24, 3779–3786 (1989). https://doi.org/10.1007/BF02385770

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