Quasi-peritectic solidification reactions in 6xxx series wrought Al alloys |
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| Affiliation: | 1. Oxford Centre for Advanced Materials and Composites, Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK;2. Alcan International Limited, Banbury Laboratory, Southam Road, Banbury, Oxon OX16 7SP, UK;4. Department of Materials Science and Engineering, Kyoto University, Japan;1. Neutron Scattering Technical Engineering Research Centre, School of Mechanical Engineering, Dongguan University of Technology, Dongguan, 523808, China;2. Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology, Dongguan University of Technology, Dongguan, 523808, China;3. National Engineering Research Centre of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China;4. Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou, 510650, China;5. Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, 40513, USA;6. School of Materials Science and Engineering, Dongguan University of Technology, Dongguan, 523808, China;7. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, CAS, Shanghai, 201204, China;8. Centre of Excellence for Advanced Materials, Dongguan, Guangdong, 523808, China;9. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;1. Department of Materials Engineering, The University of British Columbia, Vancouver V6T 1Z4, Canada;2. Department of Materials Science and Engineering, McMaster University, Hamilton L8S 4L7, Canada;3. Rio Tinto, Arvida Research and Development Centre, P. O. Box 1250, Jonquière (QC) G7S 4K8, Canada;4. SINTEF Materials and Chemistry, P. O. Box 4760 Sluppen, 7456 Trondheim, Norway |
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| Abstract: | Secondary intermetallic phase formation during directional solidification of two 6xxx series wrought Al alloys at low growth velocities of 5–30 mm/min has been investigated using differential scanning calorimetry, transmission electron microscopy and scanning transmission electron microscopy. Thermodynamic calculations predict that a quasi-peritectic reaction, L+Al13Fe4 → α-Al+α-AlFeSi, should occur during equilibrium solidification of the alloys. However, no composite Al13Fe4/α-AlFeSi particles, but composite Al13Fe4/β-AlFeSi particles and triple phase junctions have been observed for the first time, indicating a divorced metastable β-AlFeSi quasi-peritectic reaction, L+Al13Fe4 → α-Al+β-AlFeSi. More detailed analysis suggests that the metastable β-AlFeSi quasi-peritectic reaction is more favourable both at nucleation and during growth. No unique orientation relationship was found between primary Al13Fe4 and peritectic β-AlFeSi. The nucleation and growth of peritectic phases and the morphology evolution of the two intermetallic phases, Al13Fe4 and β-AlFeSi, are discussed. |
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