Effect of long period stacking ordered phase on the microstructure, texture and mechanical properties of extruded Mg–Y–Zn alloy

Tong, L.B.; Li, X.H.; Zhang, H.J.

doi:10.1016/j.msea.2012.10.088

Cited by 124 publications

(23 citation statements)

References 26 publications

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“…Their atomic stacking subcycles along the C axis were 1.6 nm and 1.8 nm, respectively (in figure 3(b)), which was consistent with the reported 18R-LPSO structure and 14H-LPSO structure [10]. The structure of the second phase was further characterized by high resolution spherical aberration electron microscopy, which proved to be typical of the LPSO phase, with a stacking order of 18 R times (figure 3(c)), consistent with previous reports [18]. In addition, as shown in figure 3(d), the 18 R structure is partially transformed into a 14H-LPSO structure during hot extrusion [19].…”

Section: Methodssupporting

confidence: 91%

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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Section: Methodssupporting

confidence: 91%

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 addition, the alloys containing LPSO structures, a thickness of a single unit cell height and having an extraordinarily large aspect ratio structure, exhibit superior mechanical properties. After rapidly solidified powder metallurgy (RS P/M), Mg-1Zn-2Y (at.%) [20,21], and Mg-Zn-(Y, Dy, Ho, Er) [22,23,24,25] alloys would obtain LPSO structures. Mg-Zn-Gd alloy could both form this staking from the supersaturated solid solution phase within elevated temperature, as reported by M. Yamasaki et al [26,27].…”

Section: Introductionmentioning

confidence: 99%

Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner

Liu

Duan

2018

Materials

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The phase constitutions of as-cast magnesium (Mg)-Zn-Gd alloys (Zn/Gd = 0.25~60, Zn 0~10 at.%, Gd 0~2 at.%, 48 samples) were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The Mg-Zn-Gd phase diagram focused on the Mg-rich corner (with up to 20 at.% Zn, 10 at.% Gd) has been set up. Five regions can be classified as follows: (I) α-Mg+W-phase+(binary compounds), (II) α-Mg+W-phase+I-phase(+binary compounds), (III) α-Mg+I-phase(+binary compounds), (IV) α-Mg+binary compounds, and (V) α-Mg. The phase diagram has been verified by solidification behaviors observation using differential thermal analysis (DTA). Moreover, the structures of I-phase and W-phase in the alloy were explored in details. In terms of the Hume-Rothery rules, I-phase is confirmed as FK-type quasicrystalline with a chemical stoichiometry as Mg30±1Zn62Gd8±1 (at.%). The composition and lattice parameter a W-phase (fcc structure, m3¯m) are affected by the composition of Mg-Zn-Gd alloys, especially by the Zn/Gd ratio of alloys. This work would be instructive for the design of Mg-Zn-Gd alloys to obtain the phase components, and then selected the strengthening ways, which could adjust its mechanical properties.

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“…Snice a high performance Mg 97 Y 2 Zn 1 alloy containing LPSO phase was prepared by rapid solidification/powder metallurgy method, the research of LPSO phase received more and more attention . Actually, researchers have developed a series of LPSO contained magnesium alloys with high performance by using conventional method and deformation process . However, the elongation of the most alloys mentioned above is not good at room temperature, except the alloys prepared by Yang et al and Tan et al Therefore, it is worth further research to improve the elongation of these magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

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 long period stacking ordered phase on the microstructure, texture and mechanical properties of extruded Mg–Y–Zn alloy

Cited by 124 publications

References 26 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

Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner

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

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Effect of long period stacking ordered phase on the microstructure, texture and mechanical properties of extruded Mg–Y–Zn alloy

Cited by 124 publications

References 26 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

Phase Formation of Mg-Zn-Gd Alloys on the Mg-rich Corner

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

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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