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Preaging effects in Al-Mg-Si alloys

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Abstract

The aging characteristics of aluminum alloy extrusions containing 0.60 to 0.90 wt pct Mg2Si were determined. At low Mg2Si levels, preaging treatments at room temperature and at elevated temperatures refined the G.P. zone dispersion and increased the alloy’s hardness after final aging. Preaging had little effect on hardness at the high end of the Mg2Si range. These results are explained on the basis of current aging theories which invoke the concept of a critical temperature, above which homogeneous nucleation does not take place. This temperature varies from ≃150°C at 0.6 pct Mg2Si to ≃220°C at 1.5 pct Mg2Si. The apparent activation energy for final aging was estimated to be 21 kcal/mole, a value which is intermediate between the activation energies for vacancy motion and solute (silicon and magnesium) diffusion in aluminum.

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  1. Center for Technology, Kaiser Aluminum and Chemical Corp., 94566, Pleasanton, Calif.

    R. C. Dorward (Staff Research Metallurgist)

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  1. R. C. Dorward
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Dorward, R.C. Preaging effects in Al-Mg-Si alloys. Metall Trans 4, 507–512 (1973). https://doi.org/10.1007/BF02648703

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  • DOI: https://doi.org/10.1007/BF02648703

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