Statistical optimization of stress level in Mg-Li-Al alloys upon hot compression testing

Islam, Rezawana; Haghshenas, M.

doi:10.1016/j.jma.2019.03.003

Cited by 31 publications

(7 citation statements)

References 17 publications

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“…During the hot extrusion, because of the low recrystallization temperature of β ‐Li, DRX occurs among those alloys, which makes β ‐Li grains have a dramatic refinement. [ 29,30 ] It can be observed in Figure 7 that all those six extruded alloys were characterized by equiaxed grains without any elongated grains, which indicates that the DRX appeared in the β ‐Li matrix of all the six alloys during the extrusion process. The dislocation density and dislocation strengthening in these recrystallized alloys were relatively low.…”

Section: Discussionmentioning

confidence: 97%

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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Section: Discussionmentioning

confidence: 97%

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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“…Among them, magnesium-lithium (Mg-Li) alloys are the lightest metal engineering materials [16,17]. According to the binary phase diagram of the Mg-Li system [18], alloying of magnesium with lithium improves the ductility of the alloy due to the transformation of the crystal structure from a hexagonal close-packed (hcp) with a lithium content of less than 5.7 wt.% (α-phase is a solid solution of lithium in magnesium) to body-centered cubic (bcc) with a Li content of more than 11.3 wt.% (β-phase, a solid solution of magnesium in lithium). In turn, magnesium alloys containing 5.7-11.3 wt.% of Li have both hcp and bcc crystal structures [16,19,20].…”

Section: Continuous Technological Development and Search For New Ener...mentioning

confidence: 99%

Corrosion Inhibition of AZ31-xLi (x = 4, 8, 12) Magnesium Alloys in Sodium Chloride Solutions by Aqueous Molybdate

Osipenko,

Paspelau,

Kasach

et al. 2024

Preprint

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In this work, corrosion inhibition of lithium-containing AZ31 magnesium alloys AZ31-xLi (x = 4, 8, and 12 wt.%) has been examined in 0.05 M NaCl solution with and without 10–150 mM of sodium molybdate as the corrosion inhibitor. X-ray diffraction, scanning electron microscopy (SEM), and energy dispersive spectroscopy analyses have been used to investigate the phase composition and microstructure of the alloys. The effectiveness of the molybdate inhibitor has been evaluated by a set of electrochemical methods, including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and dynamic electrochemical impedance spectroscopy (DEIS). Instantaneous DEIS measurements allowed to evaluate the effectiveness profile of sodium molybdate, giving high inhibition efficiency (>85%) at concentrations higher than ca. 35 mM. Post-corrosion SEM, Raman, and X-ray photoelectron spectroscopy analyses confirmed the morphology, ionic and valence composition of the formed passive layers on the surface of AZ31-xLi alloys. Based on experimental observations, a two-stage corrosion mechanism of AZ31-xLi alloys in molybdate-containing NaCl solutions has been proposed.

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“…Magnesium alloy is known as the green metal of the 21st century, due to its low density, high specific strength, excellent electromagnetic shielding effect, and recyclability, showing a wide spectrum of applications and development space [1][2][3][4][5] . Improving the performance of magnesium alloys and identifying a suitable magnesium alloy for engineering applications is a pressing issue.…”

Section: Introductionmentioning

confidence: 99%

Study on Hot Deformation Behavior and Microstructure Evolution of MgAlCuZnMnCe Alloy

Chunyu,

Nan,

Tongyu

et al. 2023

J. Phys.: Conf. Ser.

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The Mg79Al12.5Cu2.5Zn4MnCe multi-principal element alloys was prepared by induction melting under a high-purity argon. The true stress-strain curves at deformation temperatures of 250-350°C and strain rates of 0.001-1s−1 were used to establish the constitutive equations as well as the thermal processing map. The optimal hot processing parameters for the alloy were determined as a deformation temperature of 320-350°C and a strain rate of 0.1-1s−1. Further investigation into the impact of various deformation parameters on the microstructure and macrotexture of the alloy during hot compression was conducted. The findings indicate that at a deformation rate of 1s−1, the second phase of the alloy is broken and deformed. The texture intensity follows a pattern of initially decreasing and then increases as the temperature rises. The change in grain size is influenced by the deformation crushing effect, initiation of the non-substrate slip system, and grain growth. When the strain rate increases, the changes in texture intensity and distribution are not pronounced, indicating that the strain rate has minimal influence on the macro texture.

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Statistical optimization of stress level in Mg-Li-Al alloys upon hot compression testing

Cited by 31 publications

References 17 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

Corrosion Inhibition of AZ31-xLi (x = 4, 8, 12) Magnesium Alloys in Sodium Chloride Solutions by Aqueous Molybdate

Study on Hot Deformation Behavior and Microstructure Evolution of MgAlCuZnMnCe Alloy

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