Influence of cooling rate on the microstructure and ageing behavior of as-cast Al–Sc–Zr alloy |
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| Authors: | AK Lohar BN Mondal SC Panigrahi |
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| Affiliation: | 1. CMERI – Durgapur, Council of Scientific and Industrial Research (CSIR), India;2. Met. & Mat. Engg., IIT, Kharagpur, India;1. Northwestern University, Department of Materials Science and Engineering, 2220 Campus Drive, Evanston, IL 60208-3108 USA;2. NanoAl LLC, Illinois Science + Technology Park, 8025 Lamon Ave, Suite 446, Skokie, IL 60077 USA;3. Northwestern University Center for Atom-Probe Tomography, 2220 Campus Drive, Evanston, IL 60208-3108 USA;1. Institute of Materials Science and Welding, Graz University of Technology, Graz 8010, Austria;2. Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz, Austria;3. Graz Center for Electron Microscopy, Graz, Austria;4. Institute of Inorganic Chemistry, Graz University of Technology, Graz, Austria;1. Key Laboratory of Nonferrous Materials of the Chinese Ministry of Education, School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Department of Mathematical and Physical Education, Yantai Nanshan University, Yantai 265713, China;3. State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083, China;1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Aluminum Corporation of China, Haidian District, Beijing 100082, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Al–0.3Sc–0.15Zr alloy was cast using copper die, insulated alumina mould, and conventional investment shell mould to obtain a wide range of cooling rates. A novel method of quenching the investment shell mould along with the liquid metal in oil was also used which resulted in a significant increase in the cooling rate. The order in increasing average cooling rate is 0.16, 0.78, 1.28, 5.93, 7.69 °C/s. The as-cast samples were aged isothermally at 300 °C and various temperatures for 2 h. Slow cooled samples (in alumina-insulated mould) showed the presence of as-cast primary precipitates as well as rod shaped discontinuous precipitates with high density of interfacial dislocation. The amount of as-cast precipitates decreased with increase in the cooling rate. These as-cast precipitates grew at the expense of Sc in solid solution reducing the number of precipitates formed during ageing process. This results in lower increment in hardness on ageing. |
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