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High strength Mg–Zn–Y alloys reinforced synergistically by Nano-SiCp and long period stacking ordered structure

In present study, high strength nano-SiCp/Mg98Zn0.8Y1.2 composites with low SiCp content reinforced synergistically by nano-SiCp and long period stacking order (LPSO) phase have been successfully fabricated. The magnesium matrix composites (MMCs) were designed with four nano-SiCp contents (0.5, 1.0,...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-09, Vol.765, p.138284, Article 138284
Main Authors: Zhu, Jian, Zhang, Longmei, Ge, Wenqing, Fang, Xiaoying, Wu, Qiang, Sun, Jinzhao, Zhu, Guangming, Zhu, Sheng, Gao, Xuesong, Wang, William Yi, Wang, Xiaoming, Hui, Xidong
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cited_by cdi_FETCH-LOGICAL-c328t-94d23ce496477238709a0a4b2439f2913206eb93cc5034c12a9f57709c20792f3
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
container_volume 765
creator Zhu, Jian
Zhang, Longmei
Ge, Wenqing
Fang, Xiaoying
Wu, Qiang
Sun, Jinzhao
Zhu, Guangming
Zhu, Sheng
Gao, Xuesong
Wang, William Yi
Wang, Xiaoming
Hui, Xidong
description In present study, high strength nano-SiCp/Mg98Zn0.8Y1.2 composites with low SiCp content reinforced synergistically by nano-SiCp and long period stacking order (LPSO) phase have been successfully fabricated. The magnesium matrix composites (MMCs) were designed with four nano-SiCp contents (0.5, 1.0, 1.5 and 2.0 vol%). The microstructures of MMCs were significantly refined by the stimulating dynamic recrystallization effect of nano-SiCp. TEM observations indicated that numerous nano-SiCps were dispersed inside α-Mg and LPSO grains, showing a relationship with dislocations, while some were distributed along grain boundaries. The microhardness and strength of MMC increased as the SiCp content increased from 0 vol% to 1.0 vol%, but they decreased when the SiCp content increased from 1.0 vol% to 2.0 vol%. The plasticity of the MMC decreased as the SiCp content increased. The 1.0 vol% nano-SiCp MMC extruded at 330 °C exhibited excellent mechanical properties with a tensile yield strength (TYS) of 441 MPa, an ultimate tensile strength (UTS) of 464 MPa and a plastic elongation (PE) of 3.2%. Besides traditional enhanced factors, including the coefficients of thermal expansion mismatch, Orowan strengthening and grain refinement, novel synergistically strengthening of nano-SiCp and LPSO structure was the other important strengthening mechanism. During MMCs deformation, the LPSO strengthening phases were strengthened by nano-SiCps which would work as obstacles by hindering the motion of LPSO structures.
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Besides traditional enhanced factors, including the coefficients of thermal expansion mismatch, Orowan strengthening and grain refinement, novel synergistically strengthening of nano-SiCp and LPSO structure was the other important strengthening mechanism. 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The 1.0 vol% nano-SiCp MMC extruded at 330 °C exhibited excellent mechanical properties with a tensile yield strength (TYS) of 441 MPa, an ultimate tensile strength (UTS) of 464 MPa and a plastic elongation (PE) of 3.2%. Besides traditional enhanced factors, including the coefficients of thermal expansion mismatch, Orowan strengthening and grain refinement, novel synergistically strengthening of nano-SiCp and LPSO structure was the other important strengthening mechanism. 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ispartof Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2019-09, Vol.765, p.138284, Article 138284
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1873-4936
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source ScienceDirect Freedom Collection 2022-2024
subjects Deformation mechanisms
Dynamic recrystallization
Elongation
Extrusion
Grain boundaries
Grain refinement
High strength
High strength alloys
Long period stacking order structure
Magnesium base alloys
Magnesium matrix composites
Mechanical properties
Metal matrix composites
Microhardness
Nano-SiCp
Particulate composites
Polyethylenes
Silicon carbide
Stacking
Strengthening mechanism
Thermal expansion
Ultimate tensile strength
Yield strength
Zinc
title High strength Mg–Zn–Y alloys reinforced synergistically by Nano-SiCp and long period stacking ordered structure
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