Strengthening Effect and Texture of Mg–3Li Alloys Strengthened by Various Rare‐Earth Elements

Bao, Lei; Le, Qichi; Zhang, Zhiqiang

doi:10.1002/adem.201700491

Cited by 4 publications

(1 citation statement)

References 45 publications

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“…Moreover, when Li contents exceed 10.3 wt%, the microstructure of the alloy will be transformed from the duplex phase ( α + β ) to single phase ( β ). [ 6–12 ]…”

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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“…Moreover, when Li contents exceed 10.3 wt%, the microstructure of the alloy will be transformed from the duplex phase ( α + β ) to single phase ( β ). [ 6–12 ]…”

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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Observation of Twin Transmission Process in Mg Alloys by In Situ EBSD

Guo

Xin

et al. 2019

Adv Eng Mater

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Twin pairs are frequently observed at the common grain boundaries of Mg alloys. The formation of twin pairs is associated with a twin transmission (TT) process. Investigating the TT process is important for understanding the deformation mechanism of Mg alloys. Here, the authors report an in situ electron backscatter diffraction (EBSD) examination on the TT process in AZ31 Mg alloys subjected to tensile deformation. TT process is clearly observed by band contrast images resulting in the formation of twin chains as strain increases. Interestingly, transmitted twins are developed in advance in form of non‐indexing dislocations or twins in neighboring grain. The TT direction is roughly along the shear plane normal or shear direction of the paired twins. In addition, multiple twin variants are activated by TT mechanism and nucleation of new twins at pre‐existing twin boundaries.

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Magnetocaloric effect and critical behavior in ternary equiatomic magnesium compounds REPtMg (RE = Tb, Dy and Ho)

Zhang

Stein

et al. 2019

Intermetallics

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Strengthening Effect and Texture of Mg–3Li Alloys Strengthened by Various Rare‐Earth Elements

Cited by 4 publications

References 45 publications

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

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

Observation of Twin Transmission Process in Mg Alloys by In Situ EBSD

Magnetocaloric effect and critical behavior in ternary equiatomic magnesium compounds REPtMg (RE = Tb, Dy and Ho)

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