Microstructure and Mechanical Properties of EK30 Alloy Synergistically Reinforced by Ag Alloying and Hot Extrusion for Aerospace Applications
Daohe Zhang,
Sicong Zhao,
Hongtao Chen,
Yicheng Feng,
Erjun Guo,
Jingfang Li
Affiliations
Daohe Zhang
Key Laboratory of Advanced Manufacturing and Intelligent Technology (MOE), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
Sicong Zhao
Key Laboratory of Advanced Manufacturing and Intelligent Technology (MOE), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
Hongtao Chen
Key Laboratory of Advanced Manufacturing and Intelligent Technology (MOE), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
Yicheng Feng
Key Laboratory of Advanced Manufacturing and Intelligent Technology (MOE), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
Erjun Guo
Key Laboratory of Advanced Manufacturing and Intelligent Technology (MOE), School of Material Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150000, China
Jingfang Li
Key Laboratory of Functional Inorganic Material Chemistry (MOE), School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
Enhancing the mechanical properties of magnesium alloys to meet the urgent need for their lightweight applications in the aerospace field has always been a great challenge. Herein, the effect of Ag on the microstructure and tensile properties of the Mg−2.5Nd−1.0Sm−0.4Zn−0.1Ca−0.5Zr (EK30) alloy prepared by integrated extrusion and equal-channel angular pressing is studied. The microstructure of as-extruded alloys consists of α-Mg grains and the β phase. The addition of Ag increases the β-phase content. The β phase can promote dynamic recrystallization by inducing a particle-stimulated nucleation mechanism and inhibiting grain growth, which leads to grain refinement and texture weakening. At 250 °C, the ultimate tensile strength of the EK30–2.0Ag alloy (225.9 MPa) increased by 13.8% compared to the Ag-free alloy (198.4 MPa). When the tensile temperature increased from 25 °C to 250 °C, the ultimate tensile strength of the EK30–2.0Ag alloy decreased by 14.3%, from 263.7 MPa to 225.9 MPa. Notably, the addition of Ag slightly reduced the elongation of the alloy at 250 °C; the elongations of the EK30–2.0Ag alloy and the EK30 alloy are 41.5% and 37.0%, respectively. The elongation of the EK30–2.0Ag alloy increased from 22.7% at 25 °C to 52.7% at 275 °C. All alloy tensile fractures exhibited typical plastic fracture characteristics. This study provides an effective way to enhance the high-temperature mechanical properties of magnesium alloys by Ag alloying and a special severe plastic deformation method.
