Effect of magnesium on dispersoid strengthening of Al—Mn—Mg—Si (3xxx) alloys |
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| Affiliation: | 1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, N-7491 Trondheim, Norway;2. Thermomechanical Metallurgy Laboratory — PX Group Chair, Ecole Polytechnique Fédérale de Lausanne (EPFL),CH-2002 Neuchâtel, Switzerland |
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| Abstract: | The effects of magnesium addition on the dispersoid precipitation as well as mechanical properties of 3xxx alloys were investigated. The microstructures in as-cast and heat-treated conditions were evaluated by optical microscopy and transmission electron microscopy. The results reveal that Mg has a strong influence on the distribution and volume fraction of dispersoids during precipitation heat treatment. The microhardness and yield strength at ambient temperature increase with increasing Mg content. The solid solution and dispersoid strengthening mechanisms of materials after heat treatment are quantitatively analyzed. Dispersoid strengthening for the alloys is the predominant strengthening mechanism after precipitation heat treatment. An analytical model is introduced to predict the evolution of ambient-temperature yield strength. |
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| Keywords: | aluminum alloy Mg dispersoid strengthening solid solution strengthening microstructure characterization mechanical properties |
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