Impact toughness of Al–Si–Cu–Mg–Fe cast alloys: Effects of minor additives and aging conditions |
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| Affiliation: | 1. Université du Québec a Chioutmi, Québec G7H 2B1, Canada;2. General Motors, Materials Engineering, 823 Joslyn Avenue, Pontiac, MI 48340, USA;1. Center of Research Excellence in Petroleum Refining and Petrochemicals, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. Department of Polymer Engineering, Faculty of Technology, Tomas Bata University in Zlin, T.G.M. 275, 762 72 Zlin, Czech Republic;3. Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Nad Ovcirnou 3685, 760 01 Zlin, Czech Republic;4. Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, T.G.M. 275, 762 72 Zlin, Czech Republic;5. Faculty of Humanities, Tomas Bata University in Zlin, Mostni 5139, 760 01 Zlin, Czech Republic;1. Materials Research Laboratory, Kobe Steel, Ltd., 1-5-5 Takatsukadai, Nishi-ku, Kobe 651-2271, Japan;2. Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan;3. Aluminum & Copper Business, Kobe Steel, Ltd., 5-9-12 Kita-Shinagawa, Shinagawa-ku, Tokyo 141-8688, Japan;4. Tokyo Institute of Technology, Nagatsuta 4259-R2-18, Midori-ku, Yokohama 226-8503, Japan;1. Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Materials Research, Materials Mechanics, Solid State Joining Processes, Max-Planck-Straße 1, 21502 Geesthacht, Germany;2. Linde AG, Engineering Division, Werk Schalchen, Carl-von-Linde-Straße 15, 83342 Tacherting, Germany;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;2. SINTEF Materials and Chemistry, Trondheim, Norway |
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| Abstract: | The effects of Sr modification and aging treatment on the impact toughness of a near eutectic Al–11%Si–2.7%Cu–0.3%Mg–0.45%Fe alloy were investigated. Charpy impact tests were performed on unnotched specimens in the as-cast and heat-treated conditions. It was found that the presence of Fe- and Cu-containing phases increases the alloy brittleness which reduces impact toughness. The eutectic Si phase also plays an important role, where the size/morphology of the Si particles controls the area of α-Al matrix available which affects ductility and toughness. Increasing the Mn content leads to an increase in the volume fraction of the α-Al15(Mn,Fe)3Si2 phase formed and to sludge formation, which facilitates crack initiation and propagation. Crack propagation occurs mainly via the Al2Cu and/or α-Al15(Fe,Mn)3Si2 phases. In the non-modified alloys, the Si phase also plays a considerable role in the fracture process. The impact behaviour of aged alloys is influenced by the amount, size and morphology of hardening precipitates formed in the alloy, depending on the aging conditions. Aging at 240 °C produces a significant increase in the impact energy values of the low Mn-content alloys, as a result of alloy softening. The high Mn-content alloys also show a similar increase in impact energy values, but at a steady level across the same range of aging times, due to the persistence of the α-Al15(Mn,Fe)3Si2 phase. |
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| Keywords: | Aluminum alloys Sr and Mn addition Aging conditions Microstructure Impact toughness |
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