Structure and properties of 6061 + 26 mass% Si aluminum alloy produced via coupled rapid solidification and KOBO-extrusion of powder |
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| Authors: | Ludwik Blaz Makoto Sugamata Junichi Kaneko Jakub Sobota Grzegorz Wloch Wlodzimierz Bochniak Anna Kula |
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| Affiliation: | 1. AGH – University of Science and Technology, al. Mickiewicza 30, 30-059 Cracow, Poland;2. Dept. Mechanical Engineering, College of Industrial Technology, Nihon University, 1-2-1 Izumi-cho, Narashino 275-8575, Japan;1. Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany;2. Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia;3. Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany;1. Department of Materials Science and Metallurgical Engineering, ETSEIB, Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028 Barcelona, Spain;2. Department of Mechanical Engineering, Universidad Nacional de Colombia, Bogotá. Colombia;3. Department of Materials Science and Metallurgical Engineering, EUETIB, Universitat Politècnica de Catalunya, Comte d?Urgell 187, 08036 Barcelona, Spain;4. Fundació CTM Centre Tecnològic de Manresa, Plaça de la Ciencia, 2, 08243 Manresa, Spain;1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Cracow, Poland;2. Institute of Non-Ferrous Metals in Gliwice, Light Metals Division in Skawina, 19 J. Pi?sudskiego Street, 32-050 Skawina, Poland;3. AGH – University of Science and Technology, Faculty of Non-Ferrous Metals, Department of Materials Science and Non-Ferrous metals Engineering, A. Mickiewicza 30 Av., 30-059 Cracow, Poland;4. AGH – University of Science and Technology, Academic Centre for Materials and Nanotechnology, A. Mickiewicza Av. 30, 30-059 Crakow, Poland;1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta 25, 30-059 Krakow, Poland;2. AGH University of Science and Technology, Faculty of Non-Ferrous Metals, A. Mickiewicza 30, 30-059 Krakow, Poland |
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| Abstract: | Experiments on mechanical consolidation of rapidly solidified (RS) powder of 6061 + 26 mass% Si alloy were performed using the oscillating-die extrusion method. The RS powder was wrapped in thin-wall 6061-alloy cup 35 mm in diameter and vacuum-compressed by means of 100 ton press. Bars 8 mm in diameter were extruded with cross-section reduction of λ = 19 without any preheating of the charge. Tubes with a diameter/wall thickness of 14 mm/1 mm and cross-section reduction of λ = 33 were also manufactured with success. TEM/STEM observations revealed a very fine structure of as-extruded material and bimodal distribution of quasi-spherical silicon particles. Statistical analysis revealed a silicon fine fraction of 0.1–0.7 μm and a coarse fraction 2.1–2.5 μm in diameter. Examination by means of TEM did not reveal any significant changes in the morphology of the silicon particles, even when a high extrusion ratio and the material annealing after deformation were used. Hot compression tests on as-extruded rods (λ = 19) and preliminary annealed samples were performed at a constant true strain rate of 5 × 10?3 s?1 within the temperature range of 293–823 K. High strength of the material and relatively high ductility of samples deformed by compression up to ?t ? 0.4 were observed. The maximum flow stress value for as-extruded material was reduced with deformation temperature from ～390 to ～3.5 MPa for 293 and 823 K, respectively. Annealing of the samples at 773 K/30 min was found to reduce the maximum flow stress by 30–40%. Tensile strengths of similar as-cast alloys and materials manufactured by means of other powder metallurgy methods were shown for the purpose of comparison. |
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