Superplasticity of Mg-Zn-Y alloy containing quasicrystal phase processed by equal channel angular pressing |
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Authors: | MY Zheng SW Xu K Wu Y Kojima |
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Affiliation: | a School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China b Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan |
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Abstract: | Equal channel angular pressing (ECAP) has been conducted on as-cast Mg-4.3 wt.%Zn-0.7 wt.%Y Mg alloy containing quasicrystal phase at a temperature of 623 K. After 8 ECAP passes, the grain size of the as-cast alloy is decreased from ∼ 120 to ∼ 3.5 μm, and the coarse eutectic quasicrystal phases are broken and dispersed in the alloy. Tensile testing has been performed on the ECAPed Mg-Zn-Y alloy at temperatures of 523 K and 623 K with initial strain rates from 1.5 × 10− 3 to 1.5 × 10− 4 s− 1. The ECAPed alloy exhibits a maximum elongation of about 600% when testing at 623 K using an initial strain rate of 1.5 × 10− 4 s− 1. Grain boundary sliding is considered to be the dominant deformation mechanism of the Mg-Zn-Y alloy in the temperature and strain-rate range investigated. |
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Keywords: | Magnesium alloy Quasicrystal Equal channel angular pressing Microstructure Mechanical properties Superplasticity |
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