Design strategy for microalloyed ultra-ductile magnesium alloys |
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Authors: | A.C. Hänzi F.H. Dalla Torre A.S. Sologubenko P. Gunde R. Schmid-Fetzer M. Kuehlein |
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Affiliation: | 1. Department of Materials , Laboratory of Metal Physics and Technology , ETH Zurich, CH-8093 Zurich, Switzerland;2. Institute of Metallurgy, Clausthal University of Technology , D-38678 Clausthal-Zellerfeld, Germany;3. ARC Leichtmetallkompetenzzentrum Ranshofen GmbH , A-5282 Ranshofen, Austria |
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Abstract: | This article describes a design strategy deployed in developing ultra-ductile Mg alloys based on a microalloying concept, which aims to restrict grain growth considerably during alloy casting and forming. We discuss the efficiency of the design approach, and evaluate the resulting microstructural and mechanical properties. After processing, the so-designed alloys ZQCa3 (Mg–3Zn–0.5Ag–0.25Ca–0.15Mn, in wt.%) and ZKQCa3 (Mg–3Zn–0.5Zr–0.5Ag–0.25Ca–0.15Mn, in wt.%) reveal very fine grains (<10 µm), high ductility (elongation to fracture of up to 30%) at moderate strength or high strength (ultimate tensile strength of up to 350 MPa) at reasonable ductility. These properties are explained based on thermodynamic modelling, microstructure analysis including transmission electron microscopy studies, and microstructural and mechanical testing after annealing, and are compared to a related commercial alloy (ZK31). |
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Keywords: | magnesium alloys extrusion dynamic recrystallisation ductility grain growth restriction |
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