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Improving Thermal Stability in Cu-Containing Al-Mg-Si Alloys by Precipitate Optimization |
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| Authors: | Calin D. Marioara Sigmund J. Andersen Jostein Røyset Oddvin Reiso Sverre Gulbrandsen-Dahl Tor-Erik Nicolaisen Inge-Erland Opheim Jan Fredrik Helgaker Randi Holmestad |
| Affiliation: | 1. SINTEF Materials and Chemistry, 7465, Trondheim, Norway 2. Hydro Aluminium R&D Sunndal, Romsdalsvegen 1, 6600, Sunndals?ra, Norway 3. Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway 4. SINTEF Raufoss Manufacturing AS, 2831, Raufoss, Norway 5. Steertec Raufoss AS, 2831, Raufoss, Norway 6. DNV GL, P.O. Box 300, 1322, H?vik, Norway |
| Abstract: | It is demonstrated that good thermal stability in Al-Mg-Si-Cu aluminum alloys correlates with a high density of fine lath-shaped, Cu-containing, disordered L-precipitates. Alloys optimized for L retained hardness above 90 HV after 3 weeks over-aging at 473 K (200 °C). Further improvement was achieved by substituting Si by Ge in one alloy. High-angle annular dark-field scanning transmission electron microscopy showed that at peak-hardness conditions, L coexists with more common needle-shaped precipitates, often with Cu-enriched interfaces. |
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