Microstructure and High Damping Properties of Mg-Zn-Y Alloys Containing LPSO Phase and I Phase

Wan, Dongjin; Li, Junjie; Tian, Yu

doi:10.1016/s1875-5372(16)60012-7

Rare Metal Materials and Engineering

2015

DOI: 10.1016/s1875-5372(16)60012-7

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Microstructure and High Damping Properties of Mg-Zn-Y Alloys Containing LPSO Phase and I Phase

Dongjin Wan

Junjie Li

Yu Tian

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Cited by 8 publications

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“…However, the unavoidable problem is the low strength and poor corrosion resistance of magnesium alloys [4][5][6]. Therefore, researchers have done a lot of research on the strengthening and corrosion behavior of magnesium alloys [7][8][9][10].In improving the strength of magnesium alloys, magnesium rare earth alloys are the most successful systems. Recent studies have found that adding a small amount of Zn to certain Mg-RE alloys can generate a novel longperiod stacking ordered structure (referred to as long-period structure, LPSO structure) under appropriate addition amounts and process conditions.…”

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“…In conclusion, Mg-Y-Zn alloys have attracted much attention due to their excellent performance and relatively low cost [6,7]. However, most studies have focused on the microstructure and properties of a particular alloy.…”

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Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Liu

Yang

Wang

et al. 2020

Mater. Res. Express

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In this work, four Mg-Y-Zn alloys with specific Y/Zn (wt%) ratio have been prepared. The effects of Y/Zn (wt%) on the microstructure of extruded Mg-Y-Zn alloy were investigated by SEM and TEM. The mechanical properties and corrosion behavior of extruded Mg-Y-Zn alloy were also studied by tensile test, electrochemical and immersion measurements. The corrosion mechanism was studied by SEM observation of the surface morphology of the samples after immersion corrosion. The result indicates that the as-extruded Mg-6Y-3Zn alloy consists of α-Mg, W phase and long-period stacking ordered structure (LPSO) phases. Two types of LPSO structure (18 R and 14 H) appear in the asextruded alloys. The volume fraction of LSPO increases with the increase of Y and Zn atoms witht the same Y/Zn mass ratio. Mg-9Y-3Zn alloy has the best comprehensive mechanical properties. Its yield strength, ultimate tensile strength and elongation are 230 MPa, 327mpa and 23% respectively, because the volume fraction of LSPO phase in the alloy is the highest. In addition, the higher volume fraction of LPSO is beneficial to enhance the corrosion resistance of Mg-9Y-3Zn alloy.Magnesium alloys have a series of performance advantages, such as low density, good specific strength and stiffness, good casting performance and processing performance, and also has low elastic modulus, vibration and noise reduction, etc, which have been widely applied in 3 C, aerospace and automobile fields [1-3]. However, the unavoidable problem is the low strength and poor corrosion resistance of magnesium alloys [4][5][6]. Therefore, researchers have done a lot of research on the strengthening and corrosion behavior of magnesium alloys [7][8][9][10].In improving the strength of magnesium alloys, magnesium rare earth alloys are the most successful systems. Recent studies have found that adding a small amount of Zn to certain Mg-RE alloys can generate a novel longperiod stacking ordered structure (referred to as long-period structure, LPSO structure) under appropriate addition amounts and process conditions. In-depth research shows that there are three types of ternary equilibrium phases in Mg-Zn-Y alloys, which are Mg 3 YZn 6 (I-phase icosahedral quasi-crystal structure and quasi-periodic order), Mg 3 Y 2 Zn 3 (W-phase face-centered cubic structure) and Mg 12 ZnY (X-phase long period stacked ordered structure, including 6 H, 14 H and 18 R) [8]. At the same time, it is generally believed that the phase composition of the alloy depends on the Y/Zn molar ratio [9]. It is reported that LSPO is an important strengthening phase in Mg-Y-Zn alloy, and the common structures are 18 R and 14 H [10]. After heat treatment at 350°C-500°C, 18 R structure will be transformed into 14 H LPSO structure [11]. Wang J F et al reported that the LPSO structural phase can improve the mechanical properties of magnesium alloys while maintaining the good damping capacity of the alloys, and the LPSO phase arranged along the extrusion direction can act as the hardening phase [12]. It is known that hot extrusi...

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Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Liu

Yang

Wang

et al. 2020

Mater. Res. Express

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Effects of Phase Content and Evolution on the Mechanical Properties of Mg₉₅Y_2.5Zn_2.5 and Mg_93.1Y_2.5Zn_2.5Ti_1.6Zr_0.3 Alloys Containing LPSO and W Phases

Zhang

et al. 2017

Adv Eng Mater

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The effects of phase content and evolution on mechanical properties of the alloys are investigated by extruding Mg 95 Y 2.5 Zn 2.5 and Mg 93.1 Y 2.5 Zn 2.5 Ti 1.6 Zr 0.3 alloys with different original microstructures. The 18R-LPSO phase plays a decisive role in the strength of as-extruded alloys. The spherical W-MgYZn 2 phase enhances the deformability and ductility of the alloys. The dynamic recrystallization grains can be observed in all as-extruded alloys. However, the 14H-LPSO clusters and dynamic precipitates only form in the as-cast and T41-treated (solid-solution treatment at 530 C for 3 h with water cooling) alloys after extrusion. Based on synergistic effects of these phases mentioned above, the T41-treated Mg 93.1 Y 2.5 Zn 2.5 Ti 1.6 Zr 0.3 alloy exhibits good compressive mechanical properties after extrusion.

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Effect of solidification mode on microstructure evolution and properties of magnesium alloy with long-period stacking ordered phase

Li,

Chen,

Zhang

et al. 2023

J. Iron Steel Res. Int.

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Microstructure and High Damping Properties of Mg-Zn-Y Alloys Containing LPSO Phase and I Phase

Cited by 8 publications

References 29 publications

Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Effects of Phase Content and Evolution on the Mechanical Properties of Mg₉₅Y_2.5Zn_2.5 and Mg_93.1Y_2.5Zn_2.5Ti_1.6Zr_0.3 Alloys Containing LPSO and W Phases

Effect of solidification mode on microstructure evolution and properties of magnesium alloy with long-period stacking ordered phase

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Microstructure and High Damping Properties of Mg-Zn-Y Alloys Containing LPSO Phase and I Phase

Cited by 8 publications

References 29 publications

Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Effect of Y/Zn ratio on microstructure and properties of as-extruded Mg-Y-Zn alloys

Effects of Phase Content and Evolution on the Mechanical Properties of Mg95Y2.5Zn2.5 and Mg93.1Y2.5Zn2.5Ti1.6Zr0.3 Alloys Containing LPSO and W Phases

Effect of solidification mode on microstructure evolution and properties of magnesium alloy with long-period stacking ordered phase

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Effects of Phase Content and Evolution on the Mechanical Properties of Mg₉₅Y_2.5Zn_2.5 and Mg_93.1Y_2.5Zn_2.5Ti_1.6Zr_0.3 Alloys Containing LPSO and W Phases