Effects of Al and Y Addition on Microstructures and Mechanical Properties of As‐Cast Mg–14Li Based Alloy

Gao, Zhankui; Liu, Wencaı; Wu, Guohua; Zhang, Liang; Ji, Hao; Ouyang, Sijie; Peng, Xuan; Xiao, Lv; Ding, Wei

doi:10.1002/adem.201800755

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…The preferential formation of Al 2 Y is attributed to the large difference in electronegativity between Al and Y elements. Al 2 Y is a thermally stable phase with a high melting point (up to 1485 °C), [ 22 ] which can be formed before the solidification of the α‐Mg matrix. On the one hand, Al 2 Y can provide the nucleation points of the matrix; on the other hand, it can hinder the growth of grains.…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic of SAED is consistent with the stacking faults (SFs),[21] so it is judged that the parallel thin strip-like phase is not the second phase but SFs.The preferential formation of Al 2 Y is attributed to the large difference in electronegativity between Al and Y elements. Al 2 Y is a thermally stable phase with a high melting point (up to 1485 C),[22] which can be formed before the solidification…”

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confidence: 99%

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Effects of Al, Y, and Zn Additions on the Microstructure and Mechanical Properties of Mg−3Li Alloy

Yang

Wang

et al. 2022

Adv Eng Mater

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The influence of Al, Y, and Zn additions on the microstructure and mechanical properties of Mg−3Li alloy is investigated. It is revealed that Al and Y form the Al2Y phase that can refine α‐Mg grains. Y and Zn form the 18R long‐period‐stacking‐ordered (LPSO) structure phase that can coordinate deformation. In addition, the formed SFs can hinder dislocation slip. However, the Mg24Y5 phase weakens the grain boundaries. After solid solution at 520 °C, the Al2Y phase and LPSO phase do not change. The Mg24Y5 phase gradually disappears, SFs decrease, and the grain of the alloy grows. After subsequent hot rolling at 350 °C, the grains and LPSO phase are gradually elongated along the rolling direction, and the LPSO phase is twisted. SFs increase and the grain of the alloy is refined. In addition, MgY phase is precipitated inside the matrix. With the rolling reduction of 70%, the Mg−3Li−1Al−4Y−1Zn alloy possesses the ultimate tensile strength (UTS) and elongation (EL) values of 287 MPa and 5.2%.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Effects of Al, Y, and Zn Additions on the Microstructure and Mechanical Properties of Mg−3Li Alloy

Yang

Wang

et al. 2022

Adv Eng Mater

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“…Due to the low density, good machinability, high specific strength, and good damping capacity, magnesium alloys have received widespread attention as a recyclable structural material in the automotive and aerospace fields. [1][2][3][4] Compared with conventional aluminum and magnesium alloys, Mg-Gd-Y alloys have been reported to exhibit higher strength not only at ambient temperature, but also at elevated temperature and to display remarkable corrosion resistance and creep resistance. [5][6][7][8] Recently, abundant works have been conducted in relation to the Mg-Gd-Y system.…”

Section: Introductionmentioning

confidence: 99%

High‐Cycle Fatigue Behavior of Deep Cryogenic–Elevated Temperature Cycling Treated Sand‐Cast Mg–6Gd–3Y–0.5Zr Alloy

Liu

Wen

Meng³

et al. 2021

Adv Eng Mater

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Herein, the high‐cycle fatigue behavior of the sand‐cast Mg–6Gd–3Y–0.5Zr (VW63Z) alloy is investigated. Deep cryogenic–elevated temperature cycling (DCETC) treatment is used to simulate the thermal cycling in space. The results indicate that the DCETC treatment can influence the high‐cycle fatigue performance of the sand‐cast VW63Z alloy. Especially, the fatigue strength of the VW63Z alloy in T6 state is improved to 140 MPa after three DCETC cycles. The changes in fatigue performance arise from the transformation of β′ phases in the DCETC treatment process. In addition, the formation and propagation of the fatigue crack during high‐cycle fatigue test are also studied systematically.

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“…Therefore, it has great significance to improve the performance of the superlight Mg–14Li‐based alloy. [ 13–16 ]…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

et al. 2020

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Magnesium-lithium alloy is the lightest metal engineering material, which possesses broad applications in the domains of aviation industries and military affairs because of its remarkable advantages, such as perfect electromagnetic shielding, damping properties, and superhigh specific stiffness and strength. Among those significant superiorities, its lower density is the most brilliant feature, which is 1/4-1/3 lighter than that of ordinary magnesium alloys, and almost 1/2 of aluminum alloys. [1-5] In addition, there exists an interest and important structure transformation from hexagonal close-packed (hcp) to bodycentered cubic (bcc) with the increasing Li content in binary Mg-Li alloys, which can reduce the crystal parameter (c/a ratio) of α-Mg and activate more non-basal slip systems. When the mass fraction of Li contents is more than 5.7 wt%, Mg-Li alloy presents a typical duplex-phase structure, which consists of α-Mg (hcp) and β-Li (bcc) phases. Moreover, when Li contents exceed 10.3 wt%, the microstructure of the alloy will be transformed from the duplex phase (α þ β) to single phase (β). [6-12] LA141 (Mg-14Li-1Al) is a kind of superlight alloy (1.333 g cm À3) among the commercial Mg-Li alloys. However, its wide uses are limited by existing problems involving low strength, weak anti-corrosion, and worse age hardening stability. Therefore, it has great significance to improve the performance of the superlight Mg-14Li-based alloy. [13-16] Optimal alloying addition might offer an attractive alternative. Shechtman was the first to discover quasicrystals in magnesium alloys in 1984. The atomic arrangement of quasicrystals is quite different from that of traditional crystals and amorphous alloys, which can significantly improve the comprehensive properties of magnesium alloys. [17-23] In recent years, the idea of quasicrystalline strengthening has been used for reference in the study of Mg-Li alloys. The addition of rare earth elements (RE), such as Y and Gd, to Mg-Li-Zn alloys can produce quasicrystalline strengthening phases with hightemperature stability and other kinds of mesophase strengthening matrices. In addition, Y and Gd have relatively higher solid solubility in the α-Mg matrix. [24] However, there are few reports about the strengthening effect of Zn/Y and Zn/Gd addition on Mg-Li alloy with single β-Li phase. Accordingly, elements Zn, Y, and Gd were added to the chosen Mg-14Li-based alloy. Therefore, Mg-14Li-2Zn-1Y (named LZY1421), Mg-14Li-3Zn-1Y (named LZY1431), Mg-14Li-6Zn-2Y (named LZY1462) and Mg-14Li-2Zn-1Gd (named LZG1421), Mg-14Li-3Zn-1Gd (named LZG1431), Mg-14Li-6Zn-2Gd (named LZG1462) alloys were prepared as

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Effects of Al and Y Addition on Microstructures and Mechanical Properties of As‐Cast Mg–14Li Based Alloy

Cited by 12 publications

References 29 publications

Effects of Al, Y, and Zn Additions on the Microstructure and Mechanical Properties of Mg−3Li Alloy

Effects of Al, Y, and Zn Additions on the Microstructure and Mechanical Properties of Mg−3Li Alloy

High‐Cycle Fatigue Behavior of Deep Cryogenic–Elevated Temperature Cycling Treated Sand‐Cast Mg–6Gd–3Y–0.5Zr Alloy

Microstructural Evolution and Mechanical Properties of As‐Cast and As‐Extruded Mg–14Li Alloy with Different Zn/Y and Zn/Gd Addition

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