Microstructure and strengthening mechanism of Mg—5.88Zn—0.53Cu—0.16Zr alloy solidified under high pressure |
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| Affiliation: | 1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Str., 30-059, Kraków, Poland;2. The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, 152 Radzikowskiego Str., 31-342, Krakow, Poland;3. AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Department of Solid State Physics, Al. Mickiewicza 30, 30-059 Krakow, Poland;4. Department de Fisica, Universitat de Illes Balears, Ctra. de Valldemossa, km 7.5, Palma de Mallorca E-07071, Spain;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400045, China;3. Graduate School & Faculty of Engineering, Chiba University, Chiba 263-8522, Japan;4. Chongqing Academy of Science and Technology, Chongqing 401123, China |
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| Abstract: | Mg—5.88Zn—0.53Cu—0.16Zr (wt.%) alloy was solidified at 2—6 GPa using high-pressure solidification technology. The microstructure, strengthening mechanism and compressive properties at room temperature were studied using SEM and XRD. The results showed that the microstructure was refined and the secondary dendrite spacing changed from 35 μm at atmospheric pressure to 10 μm at 6 GPa gradually. Also, Mg(Zn,Cu)2 and MgZnCu eutectic phases were distributed in the shape of network, while under high pressures the second phases (Mg(Zn,Cu)2 and Mg7Zn3) were mainly granular or strip-like. The solid solubility of Zn and Cu in the matrix built up over increasing solidification pressure and reached 4.12% and 0.32% respectively at 6 GPa. The hardness value was HV 90 and the maximum compression resistance was 430 MPa. Therefore, the grain refinement strengthening, the second phase strengthening and the solid solution strengthening are the principal strengthening mechanisms. |
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| Keywords: | high pressure solidification Mg—Zn—Cu—Zr alloy strengthening mechanism eutectic transformation |
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