Abstract
Age-hardening behaviour of an AIMgSi alloy was followed by hardness measurements during isochronal and isothermal ageing. The alloy is found to age-harden during natural ageing at room temperature after quenching from the solid solution temperature. The alloy exhibits peak hardness by artificial ageing at 200 °C for 2 hours. Isothermal ageing curves indicated that the rate of hardness increase at early stages of ageing, is dependent upon the ageing temperature in a manner which obeys an Arrhenius-type equation. An activation energy of 0.95±0.05 eV was calculated from the Arrhenius plot of the results. This activation energy shows that the process responsible for hardness increase in the early stages of ageing may be controlled by the migration of solute-vacancy complexes.
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Ismail, Z.H., Bouchra, B. Age-Hardening characteristics of an AlMgSi Alloy. Acta Physica Hungarica 71, 3–7 (1992). https://doi.org/10.1007/BF03156279
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DOI: https://doi.org/10.1007/BF03156279