Development of extruded Mg-6Er-3Y-1.5Zn-0.4Mn (wt.%) alloy with high strength at elevated temperature |
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| Affiliation: | 1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Materials Physics and Chemistry, Harbin Institute of Technology, Harbin 150001, China;3. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;4. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;5. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China;2. Department of Materials Physics and Chemistry, Harbin Institute of Technology, Harbin 150001, China;3. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, PR China;2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China;1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Materials Physics and Chemistry, Harbin Institute of Technology, Harbin 150001, China;3. Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China;4. College of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China;1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Orthopedics, The Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China;1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin, 150001, China;2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China;3. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China |
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| Abstract: | A new Mg-6Er-3Y-1.5Zn-0.4 Mn (wt.%) alloy with high strength at high temperature was designed and extruded at 350 °C. The as-extruded alloy exhibits ultimate tensile strength of 301 MPa, yield strength (along ED) of 274 MPa and thermal conductivity of 73 W/m?K at 300 °C. Such outstanding high-temperature strength is mainly attributed to the formation of nano-spaced solute-segregated basal plane stacking faults (SFs) with a large aspect ratio throughout the entire Mg matrix, fine dynamically recrystallized (DRXed) grains of 1–2 μm and strongly textured un-DRXed grains with numerous sub-structures. Microstructural examination unveils that long period stacking ordered (LPSO) phases are formed in Mg matrix of the as-cast alloy when rational design of alloy composition was employed, i.e. (Er + Y): Zn = 3: 1 and Er: Y = 1: 1 (at.%). It is worth mentioning that it is the first report regarding the formation of nano-spaced basal plane SFs throughout both DRXed and un-DRXed grains in as-extruded alloy with well-designed compositions and processing parameters. The results provide new opportunities to the development of deformed Mg alloys with satisfactory mechanical performance for high-temperature services. |
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| Keywords: | Mg alloys Stacking faults Mechanical properties Thermal conductivity |
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