Effect of Y and Ce addition on microstructures and mechanical properties of LZ91 alloys

Ji, Qing; Ma, Yajun; Wu, Ruizhi; Zhang, Jinghuai; Hou, Linrui; Zhang, Milin

doi:10.1016/j.jallcom.2019.06.003

Cited by 37 publications

(9 citation statements)

References 31 publications

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“…The grains of as-cast Mg-11Li-based alloys are obviously refined by the addition of Y/Er and Zn. The growth of grain in matrix is connected with the interfacial energy during solidification [31]. The RE atoms, as well as Zn, own a large difference in radius from Mg and Li atoms, and it means that the addition of Y/Er and Zn to Mg alloys can disrupt the arrangement of the atoms.…”

Section: Discussionmentioning

confidence: 99%

“…The RE atoms, as well as Zn, own a large difference in radius from Mg and Li atoms, and it means that the addition of Y/Er and Zn to Mg alloys can disrupt the arrangement of the atoms. Numerous atomic vacancies on the solid–liquid interface would be generated to a certain extent during the solidification process [31], which could enhance the interface energy of the alloys and offer favorable nucleation sites. Such a trend makes a positive condition for the grain refinement [32,33].…”

Section: Discussionmentioning

confidence: 99%

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The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Zhang

et al. 2019

Materials

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Although body-centered cubic (BCC) structural magnesium–lithium (Mg-Li) alloys have lower density and better formability than common hexagonal close-packed (HCP) Mg alloys, their applications remain limited due to their low strength. The purpose of this study is to investigate the effect of Y/Er and Zn addition on the microstructure and tensile properties of Mg-11Li alloy with a BCC structural matrix by comparing Mg-11Li, Mg-11Li-4Y-2Er-2Zn, and Mg-11Li-8Y-4Er-4Zn (wt %) alloys. The results indicate that the addition of Y/Er and Zn at a ratio of 3:1 cannot promote the formation of long-period stacking ordered structure in Mg-11Li alloy such as that in Mg-Y-Er-Zn alloys and the dominant intermetallic phases formed are BCC Mg24RE5 and face-centered cubic (FCC) Mg3RE2Zn3 phases. With an increase of the content of Y/Er and Zn in an as-cast alloy, the fraction of intermetallic particles increases and the grain size decreases. The addition of Y/Er, as well as Zn, dramatically promotes the refinement of dynamic recrystallization (DRX) during extrusion. The initial intermetallic phases induced by Y/Er and Zn addition are broken into relatively fine particles during extrusion, and this contributes to refining the dynamic recrystallized (DRXed) grains mainly by the particle stimulated nucleation mechanism. The as-extruded Mg-11Li-4Y-2Er-2Zn and Mg-11Li-8Y-4Er-4Zn alloys exhibit much higher tensile strength as compared with as-extruded Mg-11Li alloy, which is mainly ascribed to the refined DRXed grains and numerous dispersed intermetallic phase particles. It is suggested that further refinement of intermetallic particles in these extruded Mg-11Li-based alloys may lead to higher quality alloy materials with low density and excellent mechanical properties.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Zhang

et al. 2019

Materials

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“…According to previous studies [15,33], refinement strengthening always acts on the whole plastic deformation process. The principle of strain hardening is based on the dislocation multiplication, dislocation motion and mutual dislocation interaction [34][35][36][37]. During ARB process, the formation of a large number of dislocations restricts the base slip and increases the intensity of basal texture (Fig.…”

Section: The Effect Of Grain Boundary On Electromagneticmentioning

confidence: 99%

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg–9Li–3Al–1Zn Alloy Processed by Accumulative Roll Bonding

Wang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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High electromagnetic shielding performance was achieved in the Mg-9Li-3Al-1Zn alloy processed by accumulative roll bonding (ARB). The microstructure, electromagnetic interference shielding effectiveness (SE) in the frequency of 30-1500 MHz and mechanical properties of the alloy were investigated. A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed alloy. Results indicate that the SE of the material increases gradually with the increase in the ARB pass. The enhanced SE can be attributed to the obvious microstructure orientation caused by ARB, and the alternative arrangement of alpha(Mg) phase and beta(Li) phase. In addition, with the increase in ARB pass, the number of interfaces between layers increases and the grain orientation of each layer tends to alignment along c-axis, which is beneficial to the reflection loss and multiple reflection loss of the incident electromagnetic wave.

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“…6,7 With the addition of Li, the c/a ratio decreases from 1.624 (pure Mg) to 1.607 (Mg-17 at.% Li), from which the non-basal slips are operable. [8][9][10][11][12][13][14] Previous work has shown that prismatic slip was prevailing in Mg-Li alloy with increasing lithium contents. 9 When the Li content in Mg ranges from 17 to 30 at.%, the body-centred cubic (BCC) b-lithium phase appears, which improves the formability of Mg alloys dramatically at ambient temperatures.…”

Section: Introductionmentioning

confidence: 98%

Superplastic characteristics and forming of LZ91 Mg-Li alloy sheet

Shi-jun

Jiang

Zhan

2022

Advances in Mechanical Engineering

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Magnesium-lithium (Mg-Li) alloys, due to their high specific strength, have great potential in the modern aviation industry. The superplastic characteristics, microstructure evolution, mechanical properties, and forming process of LZ91 Mg-Li alloys at 200°C–300°C were studied in this paper. Tensile tests show that the optimal elongation of tensile specimens is 812.6% at 300°C under a strain rate of 5 × 10−4 s−1. The flow stress of the material increases with strain during the high-temperature tensile testing due to the grain coarsening . Meanwhile, low dislocation densities were observed during tension, which is not sufficient for dynamic recrystallisation to occur. The finite element method is used to investigate the forming schemes of a narrow-mouth box component. Finally, this component was manufactured by the powder pressure bulging process at 300°C experimentally.

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Effect of Y and Ce addition on microstructures and mechanical properties of LZ91 alloys

Cited by 37 publications

References 31 publications

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg–9Li–3Al–1Zn Alloy Processed by Accumulative Roll Bonding

Superplastic characteristics and forming of LZ91 Mg-Li alloy sheet

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