Mechanical properties and microstructural evolution in a superlight Mg-7.28Li-2.19Al-0.091Y alloy fabricated by rolling

Cao, Furong; Zhou, Bijin; Ding, Xin; Zhang, Jian; Xu, Guangming

doi:10.1016/j.jallcom.2018.02.185

Cited by 46 publications

(4 citation statements)

References 38 publications

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“…This result is mainly attributed to the transformation of the crystal structure of the Mg-Li alloy from the hcp structure to the bcc structure. It has been reported that the hardness of the α-Mg matrix is higher than that of the β-Li matrix [20]. With the increase in Li content, the content of the soft β-Li matrix in the alloy increased gradually, and thus the hardness of the alloy decreased gradually.…”

Section: Mechanical Propertiesmentioning

confidence: 97%

Effect of Li Content on the Microstructure and Mechanical Properties of as-Homogenized Mg-Li-Al-Zn-Zr Alloys

Sun

Zhang

Ren

et al. 2023

Alloys

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The microstructure and mechanical properties of as-homogenized Mg-xLi-3Al-2Zn-0.2Zr alloys (x = 5, 7, 8, 9, 11 wt.%) were studied. As the Li content increased from 5 wt.% to 11 wt.%, the alloy matrix changed from the α-Mg single-phase to α-Mg+β-Li dual-phase and then to the β-Li single-phase. Homogenized With the increase in Li content, the alloy strength decreased while the elongation increased, and the corresponding fracture mechanism changed from cleavage fracture to microvoid coalescence fracture. This is mainly attributed to the matrix changing from α-Mg with hcp structure to β-Li with bcc structure. Additionally, the increase in the AlLi softening phase led to the reduction of Al and Zn dissolved in the alloy matrix with increasing Li content, which is one of the reasons for the decrease in alloy strength.

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Section: Mechanical Propertiesmentioning

confidence: 97%

Effect of Li Content on the Microstructure and Mechanical Properties of as-Homogenized Mg-Li-Al-Zn-Zr Alloys

Sun

Zhang

Ren

et al. 2023

Alloys

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“…Therefore, several approaches including alloying [9], heat treatment [10], traditional extrusion [8], rolling [11], forging [12], severe plastic deformation (SPD) such as equal channel angular pressing (ECAP) [12][13][14], high-pressure torsion [15], and accumulative roll bonding (ARB) [16], etc., have been explored to improve alloy strengths.…”

Section: Introductionmentioning

confidence: 99%

Effects of Friction Stir Processing on the Microstructure and Mechanical Properties of an Ultralight Mg-Li Alloy

Song,

Wu,

et al. 2024

Crystals

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Magnesium–lithium alloys are arguably the lightest metal structural materials but have low strength. In order to increase strength, friction stir processing (FSP) is applied to a hot-rolled Mg-10Li-3Al-3Zn (LA103Z) sheet to study the effects on the microstructure and mechanical properties. In this study, the strengthening mechanisms of various FSP regions of an Mg-Li alloy were clarified by a combination of numerical simulation and experimental method. Based on ANSYS APDL, a finite element model with a moving heat source is established. Rotational speeds of 800, 1000, and 1200 rpm and traverse speeds of 100, 110, and 120 mm/min were used in this research. The simulation results confirm that the influence of the rotation speed on the alloy temperature field is greater than that of the travel speed. The temperature of the processing area increases with an increase in rotation speed and decreases with an increase in travel speed. Then, hot-rolled LA103Z alloy plates are processed by FSP. The correspondence between the numerical simulation and experiment was verified by infrared thermography. The results indicate that FSP decreases the grain size significantly for the dynamic recrystallization and dramatic mechanical crushing of the stirring pin. The α-Mg and AlLi are solid soluted in the β-Li matrix. The tensile strength of the processing zone is 260.67 MPa (1000 rpm, 110 mm/min) versus the 170.47 MPa of the base metal. The SZ has the highest microhardness of 77.8 HV (800 rpm, 120 mm/min) and decreases gradually to the BM. The severe deformation, recrystallization, and solid solution of the α-Mg are important factors contributing to the improved mechanical properties.

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“…Magnesium-lithium (Mg-Li) alloy is the lightest nonpoisonous alloy. Due to extremely low density, excellent specific stiffness, good weight-to-density ratio, good electromagnetic shielding property, and damping property, studies on Mg-Li alloys have attracted extensive attention from the researchers, not only for room temperature property and microstructure [1][2][3] but also for high temperature behavior, in particular, superplasticity [4][5][6][7][8][9]. Under this background, we designed and fabricated a novel two-phase Mg-7Li-2Al-1Y alloy and investigated its high temperature behavior.…”

Section: Introductionmentioning

confidence: 99%

Cavity Nucleation Study during Quasi-Superplasticity of an Ultralight Coarse-Grained Rolled Mg-7.28Li-2.19Al-0.1Y Alloy

Furong¹,

Bijin²,

Nanpan³

et al. 2021

Int J Metall Met Phys

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Cavity or cavitation is a phenomenon in superplasticity and creep and is significant to the prediction of cavity mechanism. However, compared to cavity growth, cavity nucleation is rarely reported in magnesium alloy, especially Mg-Li alloy. To investigate the cavitation nucleation, a novel Mg-7.28Li-2.19Al-0.1Y alloy has been fabricated by hot rolling and cold rolling; its flow stress and microstructural cavitation at elevated temperatures were investigated by optical microscopy and tensile tester. The maximum elongation to failure of 265.8% was demonstrated in this alloy at a temperature of 623 K and a strain rate of 5.0 × 10 -4 s -1 . Experimental results revealed that cavity or cavitation nucleated at interphase boundary and α-Mg grain boundary in quasi-superplasticity Mg-7.28Li-2.19Al-0.091Y alloy. The present alloy had coarse grain sizes and cavity nucleation was easy to initiate in this coarse-grained alloy. Helmholtz free energy map was plotted to predict the easy and difficulty of cavity nucleation in the present alloy. This work will enhance the workability and understand the fracture initiation behavior in the present α-Mg phase dominated alloy.

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Mechanical properties and microstructural evolution in a superlight Mg-7.28Li-2.19Al-0.091Y alloy fabricated by rolling

Cited by 46 publications

References 38 publications

Effect of Li Content on the Microstructure and Mechanical Properties of as-Homogenized Mg-Li-Al-Zn-Zr Alloys

Effect of Li Content on the Microstructure and Mechanical Properties of as-Homogenized Mg-Li-Al-Zn-Zr Alloys

Effects of Friction Stir Processing on the Microstructure and Mechanical Properties of an Ultralight Mg-Li Alloy

Cavity Nucleation Study during Quasi-Superplasticity of an Ultralight Coarse-Grained Rolled Mg-7.28Li-2.19Al-0.1Y Alloy

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