Effects of magnesium,tin and nitrogen on the sintering response of aluminum powder |
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| Authors: | IA MacAskill RL Hexemer IW Donaldson DP Bishop |
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| Affiliation: | 1. Materials Engineering, Department of Process Engineering and Applied Science, Dalhousie University, “F” Building Room F-201, 1360 Barrington St., Halifax, Nova Scotia, Canada B3J 1Z1;2. GKN Sinter Metals LLC, 3300 University Drive, Auburns Hills, MI 48326, USA;1. Department of Materials and Mechanical Engineering, Buein Zahra Technical University, 3451745346, Qazvin, Iran;2. School of Engineering, Jönköping University, PO Box 1026, 551 11 Jönköping, Sweden;3. Department of Mechanical Engineering, Faculty of Engineering, University of Ottawa, Ontario, K1N 6N5, Canada;4. École Polytechnique de Montréal, Dép. de Génie Chimique, P.O. Box 6079, Centre-ville, Montreal, Quebec, H3C 3A7, Canada;1. National Metal and Materials Technology Center, 114 Thailand Science Park, Paholyothin Rd., Klong Nung, Klong Luang, Pathumthani 12120, Thailand;2. TAIST Tokyo Tech Automotive Engineering Program, International College, King Mongkut''s Institute of Technology Ladkrabang, Chalongkrung Rd., Ladkrabang, Bangkok 10520, Thailand;1. Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, QC, Canada H3A 0C5;2. Department of Process Engineering and Applied Science, Dalhousie University, 1360 Barrington Street, Halifax, NS, Canada B3J 1Z1 |
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| Abstract: | In this work the effects of magnesium and tin on the sintering response of air atomized aluminum powder were considered. The nature of the raw powders and their concentrations were key experimental variable. Compacts of pure aluminum powder sintered poorly and reacted with the purified nitrogen atmosphere. This was manifested as a subtle mass gain. Tin dampened this effect for all concentrations considered (0.1–2 w/o). The reduction was maximized with a tin addition of 1.5 w/o. Magnesium additions improved the sintering response of the aluminum powder and increased the propensity for reaction with gaseous nitrogen. Aluminum nitride was confirmed as the principal reaction product. The extent of nitridation was influenced by the amount of magnesium present and the raw powder form utilized (elemental, master alloy). The most desirable sintering response was observed in an Al–1.5Sn–1.5Mg alloy made exclusively from elemental powders. This system sintered to near full theoretical density (99.5%) yet no observable amount of nitridation had transpired. The system exhibited excellent tensile ductility (?f ～15%) for a press-and-sinter aluminum P/M alloy. |
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